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2(2+5v)=84
We move all terms to the left:
2(2+5v)-(84)=0
We add all the numbers together, and all the variables
2(5v+2)-84=0
We multiply parentheses
10v+4-84=0
We add all the numbers together, and all the variables
10v-80=0
We move all terms containing v to the left, all other terms to the right
10v=80
v=80/10
v=8
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