Example

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

Question

$$\frac { - 7 } { 42 } + \frac { - 7 } { 21 } + \frac { 7 } { 84 } + \frac { 5 } { 6 }$$

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