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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
43/x = 9.2 // - 9.2
43/x-9.2 = 0
43*x^-1 = 9.2 // : 43
x^-1 = 0.21395349
-1 < 0
1/(x^1) = 0.21395349 // * x^1
1 = 0.21395349*x^1 // : 0.21395349
4.67391301 = x^1
x = 4.67391301
x = 4.67391301
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