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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)
2.5 = x/(2-(2*x)) // - x/(2-(2*x))
2.5-(x/(2-(2*x))) = 0
2.5-(x/(2-2*x)) = 0
(-1*x)/(2-2*x)+2.5 = 0
(-1*x)/(2-2*x)+(2.5*(2-2*x))/(2-2*x) = 0
2.5*(2-2*x)-1*x = 0
5-6*x = 0
(5-6*x)/(2-2*x) = 0
(5-6*x)/(2-2*x) = 0 // * 2-2*x
5-6*x = 0
5-6*x = 0 // - 5
-6*x = -5 // : -6
x = -5/(-6)
x = 5/6
x = 5/6
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