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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2.7-x)/x = 0.938462 // - 0.938462
(2.7-x)/x-0.938462 = 0
(2.7-x)/x+(-0.938462*x)/x = 0
2.7-x-0.938462*x = 0
2.7-1.938462*x = 0
(2.7-1.938462*x)/x = 0
(2.7-1.938462*x)/x = 0 // * x
2.7-1.938462*x = 0
2.7-1.938462*x = 0 // - 2.7
-1.938462*x = -2.7 // : -1.938462
x = -2.7/(-1.938462)
x = 1.39285681
x = 1.39285681
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