Răspuns :
[tex]x-\frac{x-1}{2}=2\;\;_{|\cdot2}\\
2x\,-\,x+1=4\\
\fbox{x=3}\in\mathbb{R}[/tex]
x - (x-1)/2 = 2; aduci la acelasi numitor care e 2 => 2x -x +1 = 4 => x = 3.