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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)
1/(2*x-2) = 3 // - 3
1/(2*x-2)-3 = 0
1/(2*x-2)+(-3*(2*x-2))/(2*x-2) = 0
1-3*(2*x-2) = 0
7-6*x = 0
(7-6*x)/(2*x-2) = 0
(7-6*x)/(2*x-2) = 0 // * 2*x-2
7-6*x = 0
7-6*x = 0 // - 7
-6*x = -7 // : -6
x = -7/(-6)
x = 7/6
x = 7/6
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