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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-(5/3) = 1/2 // - 1/2
4/x-(5/3)-(1/2) = 0
4/x-5/3-1/2 = 0
4*x^-1 = 13/6 // : 4
x^-1 = 13/24
-1 < 0
1/(x^1) = 13/24 // * x^1
1 = 13/24*x^1 // : 13/24
24/13 = x^1
x = 24/13
x = 24/13
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