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9v+39=3v+69
We move all terms to the left:
9v+39-(3v+69)=0
We get rid of parentheses
9v-3v-69+39=0
We add all the numbers together, and all the variables
6v-30=0
We move all terms containing v to the left, all other terms to the right
6v=30
v=30/6
v=5
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