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12=9v-6v
We move all terms to the left:
12-(9v-6v)=0
We add all the numbers together, and all the variables
-(+3v)+12=0
We get rid of parentheses
-3v+12=0
We move all terms containing v to the left, all other terms to the right
-3v=-12
v=-12/-3
v=+4
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