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D( x )
0.06-x = 0
0.06-x = 0
0.06-x = 0
0.06-x = 0 // - 0.06
-x = -0.06 // * -1
x = 0.06
x in (-oo:0.06) U (0.06:+oo)
(X^2)/(0.06-x) = 1.25 // - 1.25
(X^2)/(0.06-x)-1.25 = 0
(X^2)/(0.06-x)+(-1.25*(0.06-x))/(0.06-x) = 0
X^2-1.25*(0.06-x) = 0
X^2+1.25*x-0.075 = 0
(X^2+1.25*x-0.075)/(0.06-x) = 0
(X^2+1.25*x-0.075)/(0.06-x) = 0 // * 0.06-x
X^2+1.25*x-0.075 = 0
X^2+1.25*x-0.075 = 0 // - X^2-0.075
1.25*x = -(X^2-0.075) // : 1.25
x = (-(X^2-0.075))/1.25
x = 0.8*(0.075-X^2)
x = 0.8*(0.075-X^2)
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