Example

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

Question

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

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