Example

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

Question

$$- \frac{ 3 }{ 7 } + \frac{ 2 }{ 7 } +( \frac{ -1 }{ 7 } )$$

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