Example

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

Question

$$[(\frac{4}{7})^{9}\times(\frac{4}{7})^{3}]\div[(\frac{4}{7})^{5}\times(\frac{4}{7})^{3}]$$

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