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-v/2=-40
We move all terms to the left:
-v/2-(-40)=0
We add all the numbers together, and all the variables
-v/2+40=0
We multiply all the terms by the denominator
-v+40*2=0
We add all the numbers together, and all the variables
-1v+80=0
We move all terms containing v to the left, all other terms to the right
-v=-80
v=-80/-1
v=+80
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