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