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-2y+1=5y+-20
We move all terms to the left:
-2y+1-(5y+-20)=0
We add all the numbers together, and all the variables
-2y-(5y-20)+1=0
We get rid of parentheses
-2y-5y+20+1=0
We add all the numbers together, and all the variables
-7y+21=0
We move all terms containing y to the left, all other terms to the right
-7y=-21
y=-21/-7
y=+3
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