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D( x )
2*x-2 = 0
2*x-2 = 0
2*x-2 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x in (-oo:1) U (1:+oo)
24/(2*x-2) = 6 // - 6
24/(2*x-2)-6 = 0
24/(2*x-2)+(-6*(2*x-2))/(2*x-2) = 0
24-6*(2*x-2) = 0
36-12*x = 0
(36-12*x)/(2*x-2) = 0
(36-12*x)/(2*x-2) = 0 // * 2*x-2
36-12*x = 0
36-12*x = 0 // - 36
-12*x = -36 // : -12
x = -36/(-12)
x = 3
x = 3
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