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57=7v-6
We move all terms to the left:
57-(7v-6)=0
We get rid of parentheses
-7v+6+57=0
We add all the numbers together, and all the variables
-7v+63=0
We move all terms containing v to the left, all other terms to the right
-7v=-63
v=-63/-7
v=+9
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