7v-9v=21

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Solution for 7v-9v=21 equation: 



7v-9v=21

We move all terms to the left:

7v-9v-(21)=0

We add all the numbers together, and all the variables

-2v-21=0

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

-2v=21

v=21/-2

v=-10+1/2

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