Example

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

Question

$$\frac{ 12 }{ 7 } \times 21+ \frac{ 15 }{ 4 } \div \frac{ 3 }{ 7 } - \frac{ 4 }{ 3 }$$

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