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-6(v-7)=3v-21
We move all terms to the left:
-6(v-7)-(3v-21)=0
We multiply parentheses
-6v-(3v-21)+42=0
We get rid of parentheses
-6v-3v+21+42=0
We add all the numbers together, and all the variables
-9v+63=0
We move all terms containing v to the left, all other terms to the right
-9v=-63
v=-63/-9
v=+7
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