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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)
(3*x)/(2*x-1) = 6 // - 6
(3*x)/(2*x-1)-6 = 0
(3*x)/(2*x-1)+(-6*(2*x-1))/(2*x-1) = 0
3*x-6*(2*x-1) = 0
6-9*x = 0
(6-9*x)/(2*x-1) = 0
(6-9*x)/(2*x-1) = 0 // * 2*x-1
6-9*x = 0
6-9*x = 0 // - 6
-9*x = -6 // : -9
x = -6/(-9)
x = 2/3
x = 2/3
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