Example

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

Question

$$\frac{ 47 }{ 140 } + \frac{ 9 }{ 40 } + \frac{ 19 }{ 190 } + \frac{ 91 }{ 300 } =$$

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