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61=8v+13
We move all terms to the left:
61-(8v+13)=0
We get rid of parentheses
-8v-13+61=0
We add all the numbers together, and all the variables
-8v+48=0
We move all terms containing v to the left, all other terms to the right
-8v=-48
v=-48/-8
v=+6
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