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12=8v+4v
We move all terms to the left:
12-(8v+4v)=0
We add all the numbers together, and all the variables
-(+12v)+12=0
We get rid of parentheses
-12v+12=0
We move all terms containing v to the left, all other terms to the right
-12v=-12
v=-12/-12
v=1
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