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D( x )
0.1-(2*x) = 0
0.1-(2*x) = 0
0.1-(2*x) = 0
0.1-2*x = 0
0.1-2*x = 0 // - 0.1
-2*x = -0.1 // : -2
x = -0.1/(-2)
x = 0.05
x in (-oo:0.05) U (0.05:+oo)
0.126 = x/(0.1-(2*x)) // - x/(0.1-(2*x))
0.126-(x/(0.1-(2*x))) = 0
0.126-(x/(0.1-2*x)) = 0
(-1*x)/(0.1-2*x)+0.126 = 0
(-1*x)/(0.1-2*x)+(0.126*(0.1-2*x))/(0.1-2*x) = 0
0.126*(0.1-2*x)-1*x = 0
0.0126-1.252*x = 0
(0.0126-1.252*x)/(0.1-2*x) = 0
(0.0126-1.252*x)/(0.1-2*x) = 0 // * 0.1-2*x
0.0126-1.252*x = 0
0.0126-1.252*x = 0 // - 0.0126
-1.252*x = -0.0126 // : -1.252
x = -0.0126/(-1.252)
x = 0.0100639
x = 0.0100639
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