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-80=1-9v
We move all terms to the left:
-80-(1-9v)=0
We add all the numbers together, and all the variables
-(-9v+1)-80=0
We get rid of parentheses
9v-1-80=0
We add all the numbers together, and all the variables
9v-81=0
We move all terms containing v to the left, all other terms to the right
9v=81
v=81/9
v=9
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