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20+15q=-7+13q+11q
We move all terms to the left:
20+15q-(-7+13q+11q)=0
We add all the numbers together, and all the variables
15q-(24q-7)+20=0
We get rid of parentheses
15q-24q+7+20=0
We add all the numbers together, and all the variables
-9q+27=0
We move all terms containing q to the left, all other terms to the right
-9q=-27
q=-27/-9
q=+3
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