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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.4 = (x-0.1)/x // - (x-0.1)/x
0.4-((x-0.1)/x) = 0
(-1*(x-0.1))/x+0.4 = 0
(-1*(x-0.1))/x+(0.4*x)/x = 0
0.4*x-1*(x-0.1) = 0
0.1-0.6*x = 0
(0.1-0.6*x)/x = 0
(0.1-0.6*x)/x = 0 // * x
0.1-0.6*x = 0
0.1-0.6*x = 0 // - 0.1
-0.6*x = -0.1 // : -0.6
x = -0.1/(-0.6)
x = 0.16666667
x = 0.16666667
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