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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x-(0.12*x)-29.12)/x = 0.46 // - 0.46
(x-(0.12*x)-29.12)/x-0.46 = 0
(x-0.12*x-29.12)/x-0.46 = 0
(0.88*x-29.12)/x-0.46 = 0
(0.88*x-29.12)/x+(-0.46*x)/x = 0
0.88*x-0.46*x-29.12 = 0
0.42*x-29.12 = 0
(0.42*x-29.12)/x = 0
(0.42*x-29.12)/x = 0 // * x
0.42*x-29.12 = 0
0.42*x-29.12 = 0 // + 29.12
0.42*x = 29.12 // : 0.42
x = 29.12/0.42
x = 69.33333333
x = 69.33333333
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