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-3(-6+3v)=81
We move all terms to the left:
-3(-6+3v)-(81)=0
We add all the numbers together, and all the variables
-3(3v-6)-81=0
We multiply parentheses
-9v+18-81=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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