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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
42.4/x = 1.02 // - 1.02
42.4/x-1.02 = 0
42.4*x^-1 = 1.02 // : 42.4
x^-1 = 0.0240566
-1 < 0
1/(x^1) = 0.0240566 // * x^1
1 = 0.0240566*x^1 // : 0.0240566
41.56863397 = x^1
x = 41.56863397
x = 41.56863397
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