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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 0.0520871 // - 0.0520871
1/x-0.0520871 = 0
1*x^-1 = 0.0520871 // : 1
x^-1 = 0.0520871
-1 < 0
1/(x^1) = 0.0520871 // * x^1
1 = 0.0520871*x^1 // : 0.0520871
19.19861156 = x^1
x = 19.19861156
x = 19.19861156
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