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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
40.8/x = 4 // - 4
40.8/x-4 = 0
40.8*x^-1 = 4 // : 40.8
x^-1 = 0.09803922
-1 < 0
1/(x^1) = 0.09803922 // * x^1
1 = 0.09803922*x^1 // : 0.09803922
10.19999955 = x^1
x = 10.19999955
x = 10.19999955
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