Example

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

Question

$$\frac{\frac{3x}{x^{2}-49}+\frac{7}{x+7}}{\frac{1}{x-7}-\frac{7}{2x+14}}$$

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