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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/9 = 52/x // - 52/x
4/9-(52/x) = 0
4/9-52*x^-1 = 0
-52*x^-1 = -4/9 // : -52
x^-1 = 1/117
-1 < 0
1/(x^1) = 1/117 // * x^1
1 = 1/117*x^1 // : 1/117
117 = x^1
x = 117
x = 117
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