-21+-2q=-3

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Solution for -21+-2q=-3 equation: 



-21+-2q=-3

We move all terms to the left:

-21+-2q-(-3)=0

We add all the numbers together, and all the variables

-2q-18=0

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

-2q=18

q=18/-2

q=-9

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