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27=3v+6v
We move all terms to the left:
27-(3v+6v)=0
We add all the numbers together, and all the variables
-(+9v)+27=0
We get rid of parentheses
-9v+27=0
We move all terms containing v to the left, all other terms to the right
-9v=-27
v=-27/-9
v=+3
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