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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 2.69 // - 2.69
1/x-2.69 = 0
1*x^-1 = 2.69 // : 1
x^-1 = 2.69
-1 < 0
1/(x^1) = 2.69 // * x^1
1 = 2.69*x^1 // : 2.69
0.37174721 = x^1
x = 0.37174721
x = 0.37174721
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