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69=3v+15
We move all terms to the left:
69-(3v+15)=0
We get rid of parentheses
-3v-15+69=0
We add all the numbers together, and all the variables
-3v+54=0
We move all terms containing v to the left, all other terms to the right
-3v=-54
v=-54/-3
v=+18
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