Example

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

Question

$$\frac{ 3 }{ 7 } + \frac{ -6 }{ 11 } + \frac{ -8 }{ 21 } + \frac{ 5 }{ 22 } =$$

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