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57=4v+13
We move all terms to the left:
57-(4v+13)=0
We get rid of parentheses
-4v-13+57=0
We add all the numbers together, and all the variables
-4v+44=0
We move all terms containing v to the left, all other terms to the right
-4v=-44
v=-44/-4
v=+11
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