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v/2-13=8
We move all terms to the left:
v/2-13-(8)=0
We add all the numbers together, and all the variables
v/2-21=0
We multiply all the terms by the denominator
v-21*2=0
We add all the numbers together, and all the variables
v-42=0
We move all terms containing v to the left, all other terms to the right
v=42
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