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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-9/x = -26.9 // + 26.9
26.9-9/x = 0
-9*x^-1 = -26.9 // : -9
x^-1 = 2.98888889
-1 < 0
1/(x^1) = 2.98888889 // * x^1
1 = 2.98888889*x^1 // : 2.98888889
0.33457249 = x^1
x = 0.33457249
x = 0.33457249
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