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80=8-9v
We move all terms to the left:
80-(8-9v)=0
We add all the numbers together, and all the variables
-(-9v+8)+80=0
We get rid of parentheses
9v-8+80=0
We add all the numbers together, and all the variables
9v+72=0
We move all terms containing v to the left, all other terms to the right
9v=-72
v=-72/9
v=-8
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