Example

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

Question

$$(\frac{2}{4}of\frac{168}{63}+\frac{3}{4}-1\frac{4}{9})\div\frac{15}{7}$$

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