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89=9+5v
We move all terms to the left:
89-(9+5v)=0
We add all the numbers together, and all the variables
-(5v+9)+89=0
We get rid of parentheses
-5v-9+89=0
We add all the numbers together, and all the variables
-5v+80=0
We move all terms containing v to the left, all other terms to the right
-5v=-80
v=-80/-5
v=+16
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