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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.6 = 9.3/x // - 9.3/x
2.6-(9.3/x) = 0
2.6-9.3*x^-1 = 0
-9.3*x^-1 = -2.6 // : -9.3
x^-1 = 0.27956989
-1 < 0
1/(x^1) = 0.27956989 // * x^1
1 = 0.27956989*x^1 // : 0.27956989
3.57692311 = x^1
x = 3.57692311
x = 3.57692311
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