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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

$$\frac{ 1 }{ 7 } + \frac{ 3 }{ 21 } - \frac{ 1 }{ 14 }$$