80=8-9v

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Solution for 80=8-9v equation: 



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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