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9(v+4)=-4v-42
We move all terms to the left:
9(v+4)-(-4v-42)=0
We multiply parentheses
9v-(-4v-42)+36=0
We get rid of parentheses
9v+4v+42+36=0
We add all the numbers together, and all the variables
13v+78=0
We move all terms containing v to the left, all other terms to the right
13v=-78
v=-78/13
v=-6
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