Example

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

Question

$$\frac{ 15 }{ 21 } \times \frac{ 45 }{ 3 } - \frac{ 1 }{ 15 } \div \frac{ 3 }{ 7 }$$

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