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D( x )
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:1/2) U (1/2:+oo)
6/(2*x-1) = 2 // - 2
6/(2*x-1)-2 = 0
6/(2*x-1)+(-2*(2*x-1))/(2*x-1) = 0
6-2*(2*x-1) = 0
8-4*x = 0
(8-4*x)/(2*x-1) = 0
(8-4*x)/(2*x-1) = 0 // * 2*x-1
8-4*x = 0
8-4*x = 0 // - 8
-4*x = -8 // : -4
x = -8/(-4)
x = 2
x = 2
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