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5y+8(2y-9)=12
We move all terms to the left:
5y+8(2y-9)-(12)=0
We multiply parentheses
5y+16y-72-12=0
We add all the numbers together, and all the variables
21y-84=0
We move all terms containing y to the left, all other terms to the right
21y=84
y=84/21
y=4
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