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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((x-9500000)/2)/x = 0.1 // - 0.1
((x-9500000)/2)/x-0.1 = 0
(x-9500000)/(2*x)-0.1 = 0
(x-9500000)/(2*x)+(-0.1*2*x)/(2*x) = 0
x-0.1*2*x-9500000 = 0
0.8*x-9500000 = 0
(0.8*x-9500000)/(2*x) = 0
(0.8*x-9500000)/(2*x) = 0 // * 2*x
0.8*x-9500000 = 0
0.8*x-9500000 = 0 // + 9500000
0.8*x = 9500000 // : 0.8
x = 9500000/0.8
x = 11875000
x = 11875000
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