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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/54 = 24/x // - 24/x
2/54-(24/x) = 0
2/54-24*x^-1 = 0
-24*x^-1 = -1/27 // : -24
x^-1 = 1/648
-1 < 0
1/(x^1) = 1/648 // * x^1
1 = 1/648*x^1 // : 1/648
648 = x^1
x = 648
x = 648
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