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3+6v=-3+12v
We move all terms to the left:
3+6v-(-3+12v)=0
We add all the numbers together, and all the variables
6v-(12v-3)+3=0
We get rid of parentheses
6v-12v+3+3=0
We add all the numbers together, and all the variables
-6v+6=0
We move all terms containing v to the left, all other terms to the right
-6v=-6
v=-6/-6
v=1
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