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12v=4v+72
We move all terms to the left:
12v-(4v+72)=0
We get rid of parentheses
12v-4v-72=0
We add all the numbers together, and all the variables
8v-72=0
We move all terms containing v to the left, all other terms to the right
8v=72
v=72/8
v=9
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