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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.05 = (0.1*(1-x))/x // - (0.1*(1-x))/x
0.05-((0.1*(1-x))/x) = 0
0.05-0.1*x^-1*(1-x) = 0
0.05-0.1*x^-1*(1-x) = 0
0.15-0.1*x^-1 = 0
0.15-0.1*x^-1 = 0
-0.1*x^-1 = -0.15 // : -0.1
x^-1 = 1.5
-1 < 0
1/(x^1) = 1.5 // * x^1
1 = 1.5*x^1 // : 1.5
0.66666667 = x^1
x = 0.66666667
x = 0.66666667
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