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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)
2.6 = x/(2-(2*x)) // - x/(2-(2*x))
2.6-(x/(2-(2*x))) = 0
2.6-(x/(2-2*x)) = 0
(-1*x)/(2-2*x)+2.6 = 0
(-1*x)/(2-2*x)+(2.6*(2-2*x))/(2-2*x) = 0
2.6*(2-2*x)-1*x = 0
5.2-6.2*x = 0
(5.2-6.2*x)/(2-2*x) = 0
(5.2-6.2*x)/(2-2*x) = 0 // * 2-2*x
5.2-6.2*x = 0
5.2-6.2*x = 0 // - 5.2
-6.2*x = -5.2 // : -6.2
x = -5.2/(-6.2)
x = 0.83870968
x = 0.83870968
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