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49=2v+13
We move all terms to the left:
49-(2v+13)=0
We get rid of parentheses
-2v-13+49=0
We add all the numbers together, and all the variables
-2v+36=0
We move all terms containing v to the left, all other terms to the right
-2v=-36
v=-36/-2
v=+18
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