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45=3v-12
We move all terms to the left:
45-(3v-12)=0
We get rid of parentheses
-3v+12+45=0
We add all the numbers together, and all the variables
-3v+57=0
We move all terms containing v to the left, all other terms to the right
-3v=-57
v=-57/-3
v=+19
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