21-2q=15

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Solution for 21-2q=15 equation: 



21-2q=15

We move all terms to the left:

21-2q-(15)=0

We add all the numbers together, and all the variables

-2q+6=0

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

-2q=-6

q=-6/-2

q=+3

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