Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\frac{a^{2}-x^{2}}{b^{2}-16}\cdot\frac{b+4}{a-x}+\frac{x}{4-b}$$

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