[(2X+y)-y(y+4X)-8X]÷2x
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[(2X+y)-y(y+4X)-8X]÷2x
[(2X+y)-y(y+4X)-8X]÷2x
[(2X+y)-y(y+4X)-8X]÷2x
=(2X+Y-Y^2+4XY-6X)/(2X)
=(-Y^2+Y+4XY-6X)/(2X)
=(1/2)*(Y/X)-(1/2)*(Y^2/X)+4Y-3
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