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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X^3-y)/x-y = 0
(X^3-y)/x+(x*(-y))/x = 0
X^3-y+x*(-y) = 0
X^3-y-(x*y) = 0
(X^3-y-(x*y))/x = 0
(X^3-y-(x*y))/x = 0 // * x
X^3-y-(x*y) = 0
X^3+x*(-y)-y = 0 // - X^3-y
x*(-y) = -(X^3-y) // : -y
x = (-(X^3-y))/(-y)
x = -(y^-1*(y-X^3))
x = -(y^-1*(y-X^3))
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