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5v+6(v-7)=13
We move all terms to the left:
5v+6(v-7)-(13)=0
We multiply parentheses
5v+6v-42-13=0
We add all the numbers together, and all the variables
11v-55=0
We move all terms containing v to the left, all other terms to the right
11v=55
v=55/11
v=5
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