21-3q=9

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Solution for 21-3q=9 equation: 



21-3q=9

We move all terms to the left:

21-3q-(9)=0

We add all the numbers together, and all the variables

-3q+12=0

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

-3q=-12

q=-12/-3

q=+4

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