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15=5q+20
We move all terms to the left:
15-(5q+20)=0
We get rid of parentheses
-5q-20+15=0
We add all the numbers together, and all the variables
-5q-5=0
We move all terms containing q to the left, all other terms to the right
-5q=5
q=5/-5
q=-1
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