Example

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

Question

$$\frac{ 8 }{ 7 } +( \frac{ 6 }{ 11 } )+ \frac{ 8 }{ 21 } +( \frac{ -5 }{ 22 }$$

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