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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = 4/3-(5/x) // - 4/3-(5/x)
5/x-(4/3)+2 = 0
5/x-4/3+2 = 0
5*x^-1 = -2/3 // : 5
x^-1 = -2/15
-1 < 0
1/(x^1) = -2/15 // * x^1
1 = -2/15*x^1 // : -2/15
-15/2 = x^1
x = -15/2
x = -15/2
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