[ Diet & Fitness ] Open Question : how to even up my biceps?

ok im right handed but my left arm bicep is the strongest...Y?....because on my right hand (my palm) i was worn with out a type of muscle on it that cause me to, with out noticing, bend my wrist when i first started working out. my question is how can i even out my right bicep to be close to even with my left PS i know that you cant ever have matching strength in both arms