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15-5=20q+5q
We move all terms to the left:
15-5-(20q+5q)=0
We add all the numbers together, and all the variables
-(+25q)+15-5=0
We add all the numbers together, and all the variables
-(+25q)+10=0
We get rid of parentheses
-25q+10=0
We move all terms containing q to the left, all other terms to the right
-25q=-10
q=-10/-25
q=2/5
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