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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/(2*x-1)-((2*x)/(2*x-1)) = 0
1/(2*x-1)-2*x*(2*x-1)^-1 = 0
1/(2*x-1)+(-2*x)/(2*x-1) = 0
1-2*x = 0
(1-2*x)/(2*x-1) = 0
(1-2*x)/(2*x-1) = 0 // * 2*x-1
1-2*x = 0
1-2*x = 0 // - 1
-2*x = -1 // : -2
x = -1/(-2)
x = 1/2
x in { 1/2}
x belongs to the empty set
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