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3=3v-12
We move all terms to the left:
3-(3v-12)=0
We get rid of parentheses
-3v+12+3=0
We add all the numbers together, and all the variables
-3v+15=0
We move all terms containing v to the left, all other terms to the right
-3v=-15
v=-15/-3
v=+5
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