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18=q/4+15
We move all terms to the left:
18-(q/4+15)=0
We get rid of parentheses
-q/4-15+18=0
We multiply all the terms by the denominator
-q-15*4+18*4=0
We add all the numbers together, and all the variables
-1q+12=0
We move all terms containing q to the left, all other terms to the right
-q=-12
q=-12/-1
q=+12
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