Example

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

Question

$$\frac{a^{2}-6a+9}{a^{2}-2a-3}\div\frac{a^{2}-5a-6}{a^{2}-3a+2}\times\frac{(a-3)^{2}}{(a-1)(a-2)}$$

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