9v-30=20v-21

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Solution for 9v-30=20v-21 equation: 



9v-30=20v-21

We move all terms to the left:

9v-30-(20v-21)=0

We get rid of parentheses

9v-20v+21-30=0

We add all the numbers together, and all the variables

-11v-9=0

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

-11v=9

v=9/-11

v=-9/11

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