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9(12+q)=9
We move all terms to the left:
9(12+q)-(9)=0
We add all the numbers together, and all the variables
9(q+12)-9=0
We multiply parentheses
9q+108-9=0
We add all the numbers together, and all the variables
9q+99=0
We move all terms containing q to the left, all other terms to the right
9q=-99
q=-99/9
q=-11
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