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