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20+15v=-19+12v
We move all terms to the left:
20+15v-(-19+12v)=0
We add all the numbers together, and all the variables
15v-(12v-19)+20=0
We get rid of parentheses
15v-12v+19+20=0
We add all the numbers together, and all the variables
3v+39=0
We move all terms containing v to the left, all other terms to the right
3v=-39
v=-39/3
v=-13
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