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