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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 1.61 // - 1.61
5/x-1.61 = 0
5*x^-1 = 1.61 // : 5
x^-1 = 0.322
-1 < 0
1/(x^1) = 0.322 // * x^1
1 = 0.322*x^1 // : 0.322
3.10559006 = x^1
x = 3.10559006
x = 3.10559006
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