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x in (-oo:+oo)
y = (4*x)/y // - (4*x)/y
y-((4*x)/y) = 0
y-4*x*y^-1 = 0
y-4*x*y^-1 = 0 // - y
-4*x*y^-1 = -y // : -4*y^-1
x = -y/(-4*y^-1)
x = (y^2)/4
x = (y^2)/4
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