-21=v-8

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Solution for -21=v-8 equation: 



-21=v-8

We move all terms to the left:

-21-(v-8)=0

We get rid of parentheses

-v+8-21=0

We add all the numbers together, and all the variables

-1v-13=0

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

-v=13

v=13/-1

v=-13

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