Example

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

Question

$$\frac{1}{x^{2}-5x+6}+\frac{2}{4x-x^{2}-3}-\frac{3}{x^{2}-3x+2}$$

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