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