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-v=v+20
We move all terms to the left:
-v-(v+20)=0
We add all the numbers together, and all the variables
-1v-(v+20)=0
We get rid of parentheses
-1v-v-20=0
We add all the numbers together, and all the variables
-2v-20=0
We move all terms containing v to the left, all other terms to the right
-2v=20
v=20/-2
v=-10
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