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13+v/2=4
We move all terms to the left:
13+v/2-(4)=0
We add all the numbers together, and all the variables
v/2+9=0
We multiply all the terms by the denominator
v+9*2=0
We add all the numbers together, and all the variables
v+18=0
We move all terms containing v to the left, all other terms to the right
v=-18
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