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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)
x/(2*x-1)+3 = (x+1)/(2*x-1) // - (x+1)/(2*x-1)
x/(2*x-1)-((x+1)/(2*x-1))+3 = 0
x/(2*x-1)+(-1*(x+1))/(2*x-1)+3 = 0
x/(2*x-1)+(-1*(x+1))/(2*x-1)+(3*(2*x-1))/(2*x-1) = 0
3*(2*x-1)-1*(x+1)+x = 0
6*x-3-1 = 0
6*x-4 = 0
(6*x-4)/(2*x-1) = 0
(6*x-4)/(2*x-1) = 0 // * 2*x-1
6*x-4 = 0
6*x-4 = 0 // + 4
6*x = 4 // : 6
x = 4/6
x = 2/3
x = 2/3
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