Example

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

Question

$$\frac{4}{5}+\frac{3}{7}+\frac{5}{9}+\frac{1}{5}+\frac{4}{7}+\frac{4}{9}$$

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