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64=v+7v
We move all terms to the left:
64-(v+7v)=0
We add all the numbers together, and all the variables
-(+8v)+64=0
We get rid of parentheses
-8v+64=0
We move all terms containing v to the left, all other terms to the right
-8v=-64
v=-64/-8
v=+8
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