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