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-9q=-8q-16
We move all terms to the left:
-9q-(-8q-16)=0
We get rid of parentheses
-9q+8q+16=0
We add all the numbers together, and all the variables
-1q+16=0
We move all terms containing q to the left, all other terms to the right
-q=-16
q=-16/-1
q=+16
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