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-3(v+3)=-12-4v
We move all terms to the left:
-3(v+3)-(-12-4v)=0
We add all the numbers together, and all the variables
-3(v+3)-(-4v-12)=0
We multiply parentheses
-3v-(-4v-12)-9=0
We get rid of parentheses
-3v+4v+12-9=0
We add all the numbers together, and all the variables
v+3=0
We move all terms containing v to the left, all other terms to the right
v=-3
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