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12=3v+3v
We move all terms to the left:
12-(3v+3v)=0
We add all the numbers together, and all the variables
-(+6v)+12=0
We get rid of parentheses
-6v+12=0
We move all terms containing v to the left, all other terms to the right
-6v=-12
v=-12/-6
v=+2
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