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y(y+2)-2(16-y)=7-(15-y(2+y)
We move all terms to the left:
y(y+2)-2(16-y)-(7-(15-y(2+y))=0
We add all the numbers together, and all the variables
y(y+2)-2(-1y+16)-(7-(15-y(y+2))=0
We multiply parentheses
y^2+2y+2y-(7-(15-y(y+2))-32=0
We add all the numbers together, and all the variables
y^2+4y-(7-(15-y(y+2))-32=0
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