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2(2v-7)=42
We move all terms to the left:
2(2v-7)-(42)=0
We multiply parentheses
4v-14-42=0
We add all the numbers together, and all the variables
4v-56=0
We move all terms containing v to the left, all other terms to the right
4v=56
v=56/4
v=14
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