7v-51=9v-91

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Solution for 7v-51=9v-91 equation: 



7v-51=9v-91

We move all terms to the left:

7v-51-(9v-91)=0

We get rid of parentheses

7v-9v+91-51=0

We add all the numbers together, and all the variables

-2v+40=0

We move all terms containing v to the left, all other terms to the right

-2v=-40

v=-40/-2

v=+20

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