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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)
8.2 = x/(2-(2*x)) // - x/(2-(2*x))
8.2-(x/(2-(2*x))) = 0
8.2-(x/(2-2*x)) = 0
(-1*x)/(2-2*x)+8.2 = 0
(-1*x)/(2-2*x)+(8.2*(2-2*x))/(2-2*x) = 0
8.2*(2-2*x)-1*x = 0
16.4-17.4*x = 0
(16.4-17.4*x)/(2-2*x) = 0
(16.4-17.4*x)/(2-2*x) = 0 // * 2-2*x
16.4-17.4*x = 0
16.4-17.4*x = 0 // - 16.4
-17.4*x = -16.4 // : -17.4
x = -16.4/(-17.4)
x = 0.94252874
x = 0.94252874
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