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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
27/x = 23/54 // - 23/54
27/x-(23/54) = 0
27/x-23/54 = 0
27*x^-1 = 23/54 // : 27
x^-1 = 23/1458
-1 < 0
1/(x^1) = 23/1458 // * x^1
1 = 23/1458*x^1 // : 23/1458
1458/23 = x^1
x = 1458/23
x = 1458/23
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