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-13=q/4+-9
We move all terms to the left:
-13-(q/4+-9)=0
We add all the numbers together, and all the variables
-(q/4-9)-13=0
We get rid of parentheses
-q/4+9-13=0
We multiply all the terms by the denominator
-q+9*4-13*4=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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