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13=-v+251
We move all terms to the left:
13-(-v+251)=0
We add all the numbers together, and all the variables
-(-1v+251)+13=0
We get rid of parentheses
1v-251+13=0
We add all the numbers together, and all the variables
v-238=0
We move all terms containing v to the left, all other terms to the right
v=238
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