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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)
0.43 = x/(0.1-x) // - x/(0.1-x)
0.43-(x/(0.1-x)) = 0
(-1*x)/(0.1-x)+0.43 = 0
(-1*x)/(0.1-x)+(0.43*(0.1-x))/(0.1-x) = 0
0.43*(0.1-x)-1*x = 0
0.043-1.43*x = 0
(0.043-1.43*x)/(0.1-x) = 0
(0.043-1.43*x)/(0.1-x) = 0 // * 0.1-x
0.043-1.43*x = 0
0.043-1.43*x = 0 // - 0.043
-1.43*x = -0.043 // : -1.43
x = -0.043/(-1.43)
x = 0.03006993
x = 0.03006993
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