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