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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 20.8 // - 20.8
1/x-20.8 = 0
1*x^-1 = 20.8 // : 1
x^-1 = 20.8
-1 < 0
1/(x^1) = 20.8 // * x^1
1 = 20.8*x^1 // : 20.8
0.04807692 = x^1
x = 0.04807692
x = 0.04807692
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