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(y-4)-3(y-9)-5(y+4)=0
We multiply parentheses
(y-4)-3y-5y+27-20=0
We get rid of parentheses
y-3y-5y-4+27-20=0
We add all the numbers together, and all the variables
-7y+3=0
We move all terms containing y to the left, all other terms to the right
-7y=-3
y=-3/-7
y=3/7
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