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-13=8+3v
We move all terms to the left:
-13-(8+3v)=0
We add all the numbers together, and all the variables
-(3v+8)-13=0
We get rid of parentheses
-3v-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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