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91=12-12v
We move all terms to the left:
91-(12-12v)=0
We add all the numbers together, and all the variables
-(-12v+12)+91=0
We get rid of parentheses
12v-12+91=0
We add all the numbers together, and all the variables
12v+79=0
We move all terms containing v to the left, all other terms to the right
12v=-79
v=-79/12
v=-6+7/12
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