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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 4.3/6.8 // - 4.3/6.8
1/x-(4.3/6.8) = 0
1/x-0.63235294 = 0
1*x^-1 = 0.63235294 // : 1
x^-1 = 0.63235294
-1 < 0
1/(x^1) = 0.63235294 // * x^1
1 = 0.63235294*x^1 // : 0.63235294
1.58139535 = x^1
x = 1.58139535
x = 1.58139535
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