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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+33=0
We move all terms containing v to the left, all other terms to the right
-3v=-33
v=-33/-3
v=+11
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