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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
0.2 = x/(x-1) // - x/(x-1)
0.2-(x/(x-1)) = 0
(-1*x)/(x-1)+0.2 = 0
(-1*x)/(x-1)+(0.2*(x-1))/(x-1) = 0
0.2*(x-1)-1*x = 0
-0.8*x-0.2 = 0
(-0.8*x-0.2)/(x-1) = 0
(-0.8*x-0.2)/(x-1) = 0 // * x-1
-0.8*x-0.2 = 0
-0.8*x-0.2 = 0 // + 0.2
-0.8*x = 0.2 // : -0.8
x = 0.2/(-0.8)
x = -0.25
x = -0.25
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