21-2v=9

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Solution for 21-2v=9 equation:



21-2v=9
We move all terms to the left:
21-2v-(9)=0
We add all the numbers together, and all the variables
-2v+12=0
We move all terms containing v to the left, all other terms to the right
-2v=-12
v=-12/-2
v=+6

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