Example

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

Question

$$- \frac { 7 } { 4 } - ( - \frac { 5 } { 6 } ) + ( - 1 \frac { 1 } { 3 } )$$

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