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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1.8*42.1)/x = 2.8*35.5 // - 2.8*35.5
(1.8*42.1)/x-(2.8*35.5) = 0
(1.8*42.1)/x-99.4 = 0
75.78*x^-1 = 99.4 // : 75.78
x^-1 = 1.31169174
-1 < 0
1/(x^1) = 1.31169174 // * x^1
1 = 1.31169174*x^1 // : 1.31169174
0.76237425 = x^1
x = 0.76237425
x = 0.76237425
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