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63=2v+7v
We move all terms to the left:
63-(2v+7v)=0
We add all the numbers together, and all the variables
-(+9v)+63=0
We get rid of parentheses
-9v+63=0
We move all terms containing v to the left, all other terms to the right
-9v=-63
v=-63/-9
v=+7
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