Example

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

Question

$$\frac{ 3 }{ 8 } + \frac{ 5 }{ 13 } + \frac{ 9 }{ 11 } + \frac{ 8 }{ 13 }$$

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