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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/9)/x = 48 // - 48
(4/9)/x-48 = 0
4/9*x^-1 = 48 // : 4/9
x^-1 = 108
-1 < 0
1/(x^1) = 108 // * x^1
1 = 108*x^1 // : 108
1/108 = x^1
x = 1/108
x = 1/108
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