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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/x = 1.333 // - 1.333
25/x-1.333 = 0
25*x^-1 = 1.333 // : 25
x^-1 = 0.05332
-1 < 0
1/(x^1) = 0.05332 // * x^1
1 = 0.05332*x^1 // : 0.05332
18.75468867 = x^1
x = 18.75468867
x = 18.75468867
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