Example

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

Question

$$9-1\frac{2}{9}\times3\frac{3}{11}\div5\frac{1}{7}\times\frac{7}{9}=$$

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