9=q-12

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Solution for 9=q-12 equation: 



9=q-12

We move all terms to the left:

9-(q-12)=0

We get rid of parentheses

-q+12+9=0

We add all the numbers together, and all the variables

-1q+21=0

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

-q=-21

q=-21/-1

q=+21

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