-3+-9q=-21

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Solution for -3+-9q=-21 equation: 



-3+-9q=-21

We move all terms to the left:

-3+-9q-(-21)=0

We add all the numbers together, and all the variables

-9q+18=0

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

-9q=-18

q=-18/-9

q=+2

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