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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 9/25 // - 9/25
3/x-(9/25) = 0
3/x-9/25 = 0
3*x^-1 = 9/25 // : 3
x^-1 = 3/25
-1 < 0
1/(x^1) = 3/25 // * x^1
1 = 3/25*x^1 // : 3/25
25/3 = x^1
x = 25/3
x = 25/3
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