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12=4v-256
We move all terms to the left:
12-(4v-256)=0
We get rid of parentheses
-4v+256+12=0
We add all the numbers together, and all the variables
-4v+268=0
We move all terms containing v to the left, all other terms to the right
-4v=-268
v=-268/-4
v=+67
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