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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-5)/x = 0.46 // - 0.46
(x-5)/x-0.46 = 0
(x-5)/x+(-0.46*x)/x = 0
x-0.46*x-5 = 0
0.54*x-5 = 0
(0.54*x-5)/x = 0
(0.54*x-5)/x = 0 // * x
0.54*x-5 = 0
0.54*x-5 = 0 // + 5
0.54*x = 5 // : 0.54
x = 5/0.54
x = 9.25925926
x = 9.25925926
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