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-5y-20=-4y
We move all terms to the left:
-5y-20-(-4y)=0
We get rid of parentheses
-5y+4y-20=0
We add all the numbers together, and all the variables
-1y-20=0
We move all terms containing y to the left, all other terms to the right
-y=20
y=20/-1
y=-20
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