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12+11v=-9+8v
We move all terms to the left:
12+11v-(-9+8v)=0
We add all the numbers together, and all the variables
11v-(8v-9)+12=0
We get rid of parentheses
11v-8v+9+12=0
We add all the numbers together, and all the variables
3v+21=0
We move all terms containing v to the left, all other terms to the right
3v=-21
v=-21/3
v=-7
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