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Ответ:

[tex]\frac{x}{x - 5} = \frac{25}{x - 5} \\ \frac{x}{x - 5} - \frac{25}{x - 5} = 0 \\ \frac{x - 25}{x - 5} = 0 \\ x - 25 = 0 \\ x = 25 [/tex]