Odpowiedź:
[tex] \frac{2x}{2x + 2} = \frac{x - 1}{x + 1} \\ 2x(x + 1) = (2x + 2)(x - 1) \\ {2x}^{2} + 2x = {2x}^{2} - 2x + 2x - 2 \\ 2x = - 2 \\ x = - 1[/tex]
