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D( x )
x^3 = 0
x^3 = 0
x^3 = 0
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^2)/(x^3) = 1.37 // - 1.37
(x^2)/(x^3)-1.37 = 0
1*x^-1 = 1.37 // : 1
x^-1 = 1.37
-1 < 0
1/(x^1) = 1.37 // * x^1
1 = 1.37*x^1 // : 1.37
0.72992701 = x^1
x = 0.72992701
x = 0.72992701
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