Question

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$\frac{a - 5}{a + 5}$
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Answer 1

$\frac{x - 5}{x + 5} = \frac{x - 5 \times (x - 5)}{(x - 5)(x + 5)} = \frac{x - 5 \times (x - 5)}{x - 5} = x - 5$

Здесь x вместо a

Good Luck!