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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/9 = 2.4/x // - 2.4/x
4/9-(2.4/x) = 0
4/9-2.4*x^-1 = 0
-2.4*x^-1 = -4/9 // : -2.4
x^-1 = 0.18518518
-1 < 0
1/(x^1) = 0.18518518 // * x^1
1 = 0.18518518*x^1 // : 0.18518518
5.40000015 = x^1
x = 5.40000015
x = 5.40000015
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