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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
27/x = 20/8 // - 20/8
27/x-(20/8) = 0
27/x-5/2 = 0
27*x^-1 = 5/2 // : 27
x^-1 = 5/54
-1 < 0
1/(x^1) = 5/54 // * x^1
1 = 5/54*x^1 // : 5/54
54/5 = x^1
x = 54/5
x = 54/5
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