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-v/5=42
We move all terms to the left:
-v/5-(42)=0
We multiply all the terms by the denominator
-v-42*5=0
We add all the numbers together, and all the variables
-1v-210=0
We move all terms containing v to the left, all other terms to the right
-v=210
v=210/-1
v=-210
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