Example

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

Question

$$\frac{1}{x^{2}+7x+12}+\frac{1}{x^{2}+5x+6}=\frac{2}{x^{2}+6x+8}$$

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