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-15y+4(5y-9)=84
We move all terms to the left:
-15y+4(5y-9)-(84)=0
We multiply parentheses
-15y+20y-36-84=0
We add all the numbers together, and all the variables
5y-120=0
We move all terms containing y to the left, all other terms to the right
5y=120
y=120/5
y=24
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