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40=-v/4
We move all terms to the left:
40-(-v/4)=0
We get rid of parentheses
v/4+40=0
We multiply all the terms by the denominator
v+40*4=0
We add all the numbers together, and all the variables
v+160=0
We move all terms containing v to the left, all other terms to the right
v=-160
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