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D( x )
5*x^3+5 = 0
5*x^3+5 = 0
5*x^3+5 = 0
5*x^3 = -5 // : 5
x^3 = -1
x^3 = -1 // ^ 1/3
x = -1
x in (-oo:-1) U (-1:+oo)
(4*x^3)/(5*x^3+5) = 0
4*x^3 = 0 // : 4
x^3 = 0
x = 0
x = 0
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