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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)
50 = ((x*x)/(0.2-x))*(0.2-x) // - ((x*x)/(0.2-x))*(0.2-x)
50-(((x*x)/(0.2-x))*(0.2-x)) = 0
50-x^2 = 0
-1*x^2 = -50 // : -1
x^2 = 50
x^2 = 50 // ^ 1/2
abs(x) = 5*2^(1/2)
x = 5*2^(1/2) or x = -(5*2^(1/2))
x in { 5*2^(1/2), -(5*2^(1/2)) }
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