Объясните почему: (х-2) / (5х-10) = 1/5

[latex] \frac{x-2}{5x-10} = \frac{1}{5} \\ \\ \frac{x-2}{5*(x-2)} = \frac{1}{5} \\ \\ \frac{1}{5} = \frac{1}{5} [/latex]