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13+8v=4v-3
We move all terms to the left:
13+8v-(4v-3)=0
We get rid of parentheses
8v-4v+3+13=0
We add all the numbers together, and all the variables
4v+16=0
We move all terms containing v to the left, all other terms to the right
4v=-16
v=-16/4
v=-4
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