Example

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

Question

$$( \frac{ -7 }{ 9 } ) \times ( \frac{ -9 }{ 7 } )- \frac{ 8 }{ 9 } \div \frac{ 5 }{ 8 }$$

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