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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
59/x = 4 // - 4
59/x-4 = 0
59*x^-1 = 4 // : 59
x^-1 = 4/59
-1 < 0
1/(x^1) = 4/59 // * x^1
1 = 4/59*x^1 // : 4/59
59/4 = x^1
x = 59/4
x = 59/4
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