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13v=19v-42
We move all terms to the left:
13v-(19v-42)=0
We get rid of parentheses
13v-19v+42=0
We add all the numbers together, and all the variables
-6v+42=0
We move all terms containing v to the left, all other terms to the right
-6v=-42
v=-42/-6
v=+7
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