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-12=+5v+2v
We move all terms to the left:
-12-(+5v+2v)=0
We add all the numbers together, and all the variables
-(+7v)-12=0
We get rid of parentheses
-7v-12=0
We move all terms containing v to the left, all other terms to the right
-7v=12
v=12/-7
v=-1+5/7
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