$$ L = \lim_{(x, y) \to \left(\frac{25}{2}, \frac{25}{2}\right)} \frac{x+y-25}{\sqrt{x+y}-5} $$
Step 2:
First, let's try to substitute the values of $x$ and $y$ into the expression.
Let $x = \frac{25}{2}$ and $y = \frac{25}{2}$.
Numerator: $x+y-25 = \frac{25}{2} +
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