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-9+4q=-9q+4
We move all terms to the left:
-9+4q-(-9q+4)=0
We get rid of parentheses
4q+9q-4-9=0
We add all the numbers together, and all the variables
13q-13=0
We move all terms containing q to the left, all other terms to the right
13q=13
q=13/13
q=1
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