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