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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)
1.4*10^-11 = (x^2)/(0.25-x) // - (x^2)/(0.25-x)
1.4*10^-11-((x^2)/(0.25-x)) = 0
(-1*x^2)/(0.25-x)+0 = 0
(-1*x^2)/(0.25-x)+(0*(0.25-x))/(0.25-x) = 0
0*(0.25-x)-1*x^2 = 0
-x^2 = 0
(-x^2)/(0.25-x) = 0
(-x^2)/(0.25-x) = 0 // * 0.25-x
-x^2 = 0
-1*x^2 = 0 // : -1
x^2 = 0
x = 0
x = 0
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