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D( x )
x^3 = 0
x^2 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
0 = 50/(x^3)-(5/(x^2)) // - 50/(x^3)-(5/(x^2))
5/(x^2)-(50/(x^3))+0 = 0
5/(x^2)-50*x^-3 = 0
5*x^-2-50*x^-3 = 0
(5*x^1-50*x^0)/(x^3) = 0 // * x^6
x^3*(5*x^1-50*x^0) = 0
x^3
5*x-50 = 0
5*x^1 = 50 // : 5
x^1 = 10
x = 10
x in { 10}
x = 10
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