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-3=q/15-4
We move all terms to the left:
-3-(q/15-4)=0
We get rid of parentheses
-q/15+4-3=0
We multiply all the terms by the denominator
-q+4*15-3*15=0
We add all the numbers together, and all the variables
-1q+15=0
We move all terms containing q to the left, all other terms to the right
-q=-15
q=-15/-1
q=+15
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