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10=12v-7v
We move all terms to the left:
10-(12v-7v)=0
We add all the numbers together, and all the variables
-(+5v)+10=0
We get rid of parentheses
-5v+10=0
We move all terms containing v to the left, all other terms to the right
-5v=-10
v=-10/-5
v=+2
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