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61=4v+9
We move all terms to the left:
61-(4v+9)=0
We get rid of parentheses
-4v-9+61=0
We add all the numbers together, and all the variables
-4v+52=0
We move all terms containing v to the left, all other terms to the right
-4v=-52
v=-52/-4
v=+13
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