HKIMO 2020 Grade 5 National Final (Heat) Set 01 Question 8

Find $\left(\frac73+\frac79+\frac7{27}+\frac7{81}\right)\div\left(\frac95+\frac9{15}+\frac9{45}+\frac9{135}\right)$. Write the answer in simplest form.

Source glossary (English–Vietnamese): Value: giá trị; Simplest form: dạng tối giản.