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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x-5 = 10/3 // - 10/3
4/x-(10/3)-5 = 0
4/x-10/3-5 = 0
4*x^-1 = 25/3 // : 4
x^-1 = 25/12
-1 < 0
1/(x^1) = 25/12 // * x^1
1 = 25/12*x^1 // : 25/12
12/25 = x^1
x = 12/25
x = 12/25
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