9v-21=51

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Solution for 9v-21=51 equation: 



9v-21=51

We move all terms to the left:

9v-21-(51)=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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