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6(v-3)=3v-21
We move all terms to the left:
6(v-3)-(3v-21)=0
We multiply parentheses
6v-(3v-21)-18=0
We get rid of parentheses
6v-3v+21-18=0
We add all the numbers together, and all the variables
3v+3=0
We move all terms containing v to the left, all other terms to the right
3v=-3
v=-3/3
v=-1
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