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