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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
42/x = 0.5385 // - 0.5385
42/x-0.5385 = 0
42*x^-1 = 0.5385 // : 42
x^-1 = 0.01282143
-1 < 0
1/(x^1) = 0.01282143 // * x^1
1 = 0.01282143*x^1 // : 0.01282143
77.99442028 = x^1
x = 77.99442028
x = 77.99442028
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