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D( x )
2-(2*x) = 0
2-(2*x) = 0
2-(2*x) = 0
2-2*x = 0
2-2*x = 0 // - 2
-2*x = -2 // : -2
x = -2/(-2)
x = 1
x in (-oo:1) U (1:+oo)
2.59 = x/(2-(2*x)) // - x/(2-(2*x))
2.59-(x/(2-(2*x))) = 0
2.59-(x/(2-2*x)) = 0
(-1*x)/(2-2*x)+2.59 = 0
(-1*x)/(2-2*x)+(2.59*(2-2*x))/(2-2*x) = 0
2.59*(2-2*x)-1*x = 0
5.18-6.18*x = 0
(5.18-6.18*x)/(2-2*x) = 0
(5.18-6.18*x)/(2-2*x) = 0 // * 2-2*x
5.18-6.18*x = 0
5.18-6.18*x = 0 // - 5.18
-6.18*x = -5.18 // : -6.18
x = -5.18/(-6.18)
x = 0.8381877
x = 0.8381877
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