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15=v/4+13
We move all terms to the left:
15-(v/4+13)=0
We get rid of parentheses
-v/4-13+15=0
We multiply all the terms by the denominator
-v-13*4+15*4=0
We add all the numbers together, and all the variables
-1v+8=0
We move all terms containing v to the left, all other terms to the right
-v=-8
v=-8/-1
v=+8
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