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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
92 = 4/x // - 4/x
92-(4/x) = 0
92-4*x^-1 = 0
-4*x^-1 = -92 // : -4
x^-1 = 23
-1 < 0
1/(x^1) = 23 // * x^1
1 = 23*x^1 // : 23
1/23 = x^1
x = 1/23
x = 1/23
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