Example

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

Question

$$\frac{ 7 }{ 14 } + \frac{ 6 }{ 8 } + \frac{ 4 }{ 12 } + \frac{ 3 }{ 15 } =$$

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