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v=40-7v
We move all terms to the left:
v-(40-7v)=0
We add all the numbers together, and all the variables
v-(-7v+40)=0
We get rid of parentheses
v+7v-40=0
We add all the numbers together, and all the variables
8v-40=0
We move all terms containing v to the left, all other terms to the right
8v=40
v=40/8
v=5
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