Example

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

Question

$$( \frac{ 9 }{ 7 } \times - \frac{ 28 }{ 18 } )+( \frac{ 3 }{ 4 } \times - \frac{ 3 }{ 6 } )$$

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