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45=3v-15
We move all terms to the left:
45-(3v-15)=0
We get rid of parentheses
-3v+15+45=0
We add all the numbers together, and all the variables
-3v+60=0
We move all terms containing v to the left, all other terms to the right
-3v=-60
v=-60/-3
v=+20
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