Example

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

Question

$$(- \frac{ 4 }{ 9 } + \frac{ 3 }{ 7 } ) \times ( \frac{ 9 }{ 10 } +- \frac{ 1 }{ 5 } )$$

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