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D( x )
0.25-x = 0
0.25-x = 0
0.25-x = 0
0.25-x = 0 // - 0.25
-x = -0.25 // * -1
x = 0.25
x in (-oo:0.25) U (0.25:+oo)
(x^2)/(0.25-x) = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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