Example

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

Question

$$\frac{pq-pr}{r^{2}-1}\div\frac{q^{2}-r^{2}}{r^{2}+r}$$

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