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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((5^1)/4)/x = 9/5 // - 9/5
((5^1)/4)/x-(9/5) = 0
(5/4)/x-9/5 = 0
5/4*x^-1 = 9/5 // : 5/4
x^-1 = 36/25
-1 < 0
1/(x^1) = 36/25 // * x^1
1 = 36/25*x^1 // : 36/25
25/36 = x^1
x = 25/36
x = 25/36
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