Example

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

Question

$$\frac { 18 } { 7 } - \frac { 1 } { 14 } + \frac { 16 } { 21 } + ( \frac { - 19 } { 28 } )$$

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