Example

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

Question

$$- ( 4 \frac { 5 } { 22 } ) - ( - 2 \frac { 6 } { 11 } )$$

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