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56=15v-7v
We move all terms to the left:
56-(15v-7v)=0
We add all the numbers together, and all the variables
-(+8v)+56=0
We get rid of parentheses
-8v+56=0
We move all terms containing v to the left, all other terms to the right
-8v=-56
v=-56/-8
v=+7
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