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D( x )
0.2-x = 0
0.2-x = 0
0.2-x = 0
0.2-x = 0 // - 0.2
-x = -0.2 // * -1
x = 0.2
x in (-oo:0.2) U (0.2:+oo)
4.36 = x/(0.2-x) // - x/(0.2-x)
4.36-(x/(0.2-x)) = 0
(-1*x)/(0.2-x)+4.36 = 0
(-1*x)/(0.2-x)+(4.36*(0.2-x))/(0.2-x) = 0
4.36*(0.2-x)-1*x = 0
0.872-5.36*x = 0
(0.872-5.36*x)/(0.2-x) = 0
(0.872-5.36*x)/(0.2-x) = 0 // * 0.2-x
0.872-5.36*x = 0
0.872-5.36*x = 0 // - 0.872
-5.36*x = -0.872 // : -5.36
x = -0.872/(-5.36)
x = 0.16268657
x = 0.16268657
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