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D( x )
2-(4*x) = 0
2-(4*x) = 0
2-(4*x) = 0
2-4*x = 0
2-4*x = 0 // - 2
-4*x = -2 // : -4
x = -2/(-4)
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
(4*x-2)/(2-(4*x)) = 0
(4*x-2)/(2-4*x) = 0
4*x-2 = 0 // + 2
4*x = 2 // : 4
x = 2/4
x = 1/2
x in { 1/2}
x belongs to the empty set
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