Example

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

Question

$$\frac{ 18 }{ 7 } +( \frac{ -6 }{ 5 } )+( \frac{ -8 }{ 21 } )+( \frac{ 2 }{ 15 } )$$

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