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D( x )
0.47-x = 0
0.47-x = 0
0.47-x = 0
0.47-x = 0 // - 0.47
-x = -0.47 // * -1
x = 0.47
x in (-oo:0.47) U (0.47:+oo)
(x^2)/(0.47-x) = 5.7*10^-10 // - 5.7*10^-10
(x^2)/(0.47-x)-(5.7*10^-10) = 0
(x^2)/(0.47-x)-5.7*10^-10 = 0
(x^2)/(0.47-x)+0 = 0
(x^2)/(0.47-x)+(0*(0.47-x))/(0.47-x) = 0
0*(0.47-x)+x^2 = 0
x^2 = 0
(x^2)/(0.47-x) = 0
(x^2)/(0.47-x) = 0 // * 0.47-x
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x = 0
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