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-5y+27=4y-54
We move all terms to the left:
-5y+27-(4y-54)=0
We get rid of parentheses
-5y-4y+54+27=0
We add all the numbers together, and all the variables
-9y+81=0
We move all terms containing y to the left, all other terms to the right
-9y=-81
y=-81/-9
y=+9
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