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D( x )
0.1-x = 0
0.1-x = 0
0.1-x = 0
0.1-x = 0 // - 0.1
-x = -0.1 // * -1
x = 0.1
x in (-oo:0.1) U (0.1:+oo)
2 = x/(0.1-x) // - x/(0.1-x)
2-(x/(0.1-x)) = 0
(-1*x)/(0.1-x)+2 = 0
(-1*x)/(0.1-x)+(2*(0.1-x))/(0.1-x) = 0
2*(0.1-x)-1*x = 0
0.2-3*x = 0
(0.2-3*x)/(0.1-x) = 0
(0.2-3*x)/(0.1-x) = 0 // * 0.1-x
0.2-3*x = 0
0.2-3*x = 0 // - 0.2
-3*x = -0.2 // : -3
x = -0.2/(-3)
x = 0.06666667
x = 0.06666667
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