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-20v+20=-19v
We move all terms to the left:
-20v+20-(-19v)=0
We get rid of parentheses
-20v+19v+20=0
We add all the numbers together, and all the variables
-1v+20=0
We move all terms containing v to the left, all other terms to the right
-v=-20
v=-20/-1
v=+20
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