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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.18 = 22.2/x // - 22.2/x
1.18-(22.2/x) = 0
1.18-22.2*x^-1 = 0
-22.2*x^-1 = -1.18 // : -22.2
x^-1 = 0.05315315
-1 < 0
1/(x^1) = 0.05315315 // * x^1
1 = 0.05315315*x^1 // : 0.05315315
18.81356044 = x^1
x = 18.81356044
x = 18.81356044
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