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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-25.56)/x = 0.46 // - 0.46
(x-25.56)/x-0.46 = 0
(x-25.56)/x+(-0.46*x)/x = 0
x-0.46*x-25.56 = 0
0.54*x-25.56 = 0
(0.54*x-25.56)/x = 0
(0.54*x-25.56)/x = 0 // * x
0.54*x-25.56 = 0
0.54*x-25.56 = 0 // + 25.56
0.54*x = 25.56 // : 0.54
x = 25.56/0.54
x = 47.33333333
x = 47.33333333
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