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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.4/x = 2/9 // - 2/9
2.4/x-(2/9) = 0
2.4/x-2/9 = 0
2.4*x^-1 = 2/9 // : 2.4
x^-1 = 0.09259259
-1 < 0
1/(x^1) = 0.09259259 // * x^1
1 = 0.09259259*x^1 // : 0.09259259
10.8000003 = x^1
x = 10.8000003
x = 10.8000003
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