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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.5/x-3 = 2/3 // - 2/3
4.5/x-(2/3)-3 = 0
4.5/x-2/3-3 = 0
4.5*x^-1 = 11/3 // : 4.5
x^-1 = 0.81481482
-1 < 0
1/(x^1) = 0.81481482 // * x^1
1 = 0.81481482*x^1 // : 0.81481482
1.22727272 = x^1
x = 1.22727272
x = 1.22727272
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