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12=5v-v
We move all terms to the left:
12-(5v-v)=0
We add all the numbers together, and all the variables
-(+4v)+12=0
We get rid of parentheses
-4v+12=0
We move all terms containing v to the left, all other terms to the right
-4v=-12
v=-12/-4
v=+3
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