21=9-4v

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Solution for 21=9-4v equation:



21=9-4v
We move all terms to the left:
21-(9-4v)=0
We add all the numbers together, and all the variables
-(-4v+9)+21=0
We get rid of parentheses
4v-9+21=0
We add all the numbers together, and all the variables
4v+12=0
We move all terms containing v to the left, all other terms to the right
4v=-12
v=-12/4
v=-3

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