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50=9v-13
We move all terms to the left:
50-(9v-13)=0
We get rid of parentheses
-9v+13+50=0
We add all the numbers together, and all the variables
-9v+63=0
We move all terms containing v to the left, all other terms to the right
-9v=-63
v=-63/-9
v=+7
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