Răspuns:
[tex]x(x - 1) = 2 - x \\ {x}^{2} - x = 2 - x \\ {x}^{2} - x + x - 2 = 0 \\ {x}^{2} - 2 = 0 \\ x = + \sqrt{2} \\ x = - \sqrt{2} [/tex]