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D( x )
x^3+x^3 = 0
x^3+x^3 = 0
x^3+x^3 = 0
2*x^3 = 0 // : 2
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^3-Y^3)/(x^3+x^3) = 0
(x^3-Y^3)/(2*x^3) = 0
1*x^3 = Y^3 // : 1
x^3 = Y^3
x^3 = Y^3 // ^ 1/3
x = Y
x = Y
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