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-5y=-4y-9
We move all terms to the left:
-5y-(-4y-9)=0
We get rid of parentheses
-5y+4y+9=0
We add all the numbers together, and all the variables
-1y+9=0
We move all terms containing y to the left, all other terms to the right
-y=-9
y=-9/-1
y=+9
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