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-5v+2(v-4)=13
We move all terms to the left:
-5v+2(v-4)-(13)=0
We multiply parentheses
-5v+2v-8-13=0
We add all the numbers together, and all the variables
-3v-21=0
We move all terms containing v to the left, all other terms to the right
-3v=21
v=21/-3
v=-7
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