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13=q/4+11
We move all terms to the left:
13-(q/4+11)=0
We get rid of parentheses
-q/4-11+13=0
We multiply all the terms by the denominator
-q-11*4+13*4=0
We add all the numbers together, and all the variables
-1q+8=0
We move all terms containing q to the left, all other terms to the right
-q=-8
q=-8/-1
q=+8
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