One side of my nose is wider, what the best solution to fix it? (Photo)

Based on this photo is looks that full rhinoplasty with nose reduction would be good procedure for you; this will include asymmetric reduction of nose width and height. In-person evaluation in necessary to decide about more accurate plan of correction. 3D stimulation software, like one we use in our practice (Crisalix), may help communication between patient and surgeon to create appropriate working model. Good luck.

Click on the "Learn more" link, just below my response, or go here:
FacialSurgery.com/RealSelf/RealSelf_Breezee123.html
I made a computer morph of your nose, and an animation of the morph, to show the changes that are possible for your nose in truly expert hands.
I narrowed that left side, but also the right side, and I narrowed the tip as well. The woman in the short video that I posted with this answer had the tip of her nose narrowed in a rhinoplasty.
Your tip cartilages are strong, so we can see the outline of the edges of the cartilages, and the little dent between them. I didn't want to go crazy making to too narrow -- didn't want to maybe draw something that's not possible with real surgery. Probably you'll see the changes best in the animation.
You only posted that frontal view, but often, when the nose is wide, it's the three-quarter views, like the pictured woman in the video, where the width is most noticeable.
You should understand that the changes I demonstrated in the morph require advanced techniques, techniques that most plastic surgeons cannot handle.  Be sure to read the section in the "Learn more" link on how to stay out of trouble while searching for a rhinoplasty surgeon. Rhinoplasty is an exquisitely difficult operation to get right, and you should only have surgery if you are able to make yourself very confident in your surgeon's skills. Read that page very carefully. Most plastic surgeons are quite poor at this operation, and I believe my advice will go a long way toward keeping you safe.
I'd love to hear what you think of the morph. Did it seem to address your main concerns? I could modify the morph to your taste if you wish. Frankly, it's likely that the bridge can be narrowed more than I showed.
Your nose is also a good example of why computer imaging is mandatory in rhinoplasty. You need to know exactly what the surgeon is planning to accomplish -- what features he thinks he can change, and by how much he thinks he can change them. When you see his goals, you'll know whether he has an eye for an attractive nose, and whether he shares your opinion of what constitutes an attractive nose. You'll also know whether the changes he proposes are enough to be meaningful to you, and whether he understands your wishes enough to address all of your priorities. But remember, you're not hiring him for his skills with the computer. The doctor must then show you his before and after photos to prove that he can actually accomplish what he draws on the computer.
In your case in particular, you need to find a surgeon who understands all of the issues I mentioned, and how they fit together, and who can actually accomplish them in surgery. 
Finally, at the *very* bottom of the "Learn more" page is a link to instructions on taking and sending photos that are comprehensive and useful for an online consultation like this, in case you'd like a more complete evaluation.