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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-2)/x = 0.88 // - 0.88
(x-2)/x-0.88 = 0
(x-2)/x+(-0.88*x)/x = 0
x-0.88*x-2 = 0
0.12*x-2 = 0
(0.12*x-2)/x = 0
(0.12*x-2)/x = 0 // * x
0.12*x-2 = 0
0.12*x-2 = 0 // + 2
0.12*x = 2 // : 0.12
x = 2/0.12
x = 16.66666667
x = 16.66666667
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