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12=2v-4
We move all terms to the left:
12-(2v-4)=0
We get rid of parentheses
-2v+4+12=0
We add all the numbers together, and all the variables
-2v+16=0
We move all terms containing v to the left, all other terms to the right
-2v=-16
v=-16/-2
v=+8
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