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-15q-121=-8q-79
We move all terms to the left:
-15q-121-(-8q-79)=0
We get rid of parentheses
-15q+8q+79-121=0
We add all the numbers together, and all the variables
-7q-42=0
We move all terms containing q to the left, all other terms to the right
-7q=42
q=42/-7
q=-6
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