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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 22/27 // - 22/27
5/x-(22/27) = 0
5/x-22/27 = 0
5*x^-1 = 22/27 // : 5
x^-1 = 22/135
-1 < 0
1/(x^1) = 22/135 // * x^1
1 = 22/135*x^1 // : 22/135
135/22 = x^1
x = 135/22
x = 135/22
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