Example

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

Question

$$( \frac { 3 } { 11 } \times \frac { 5 } { 6 } ) - ( \frac { 9 } { 22 } \div \frac { 3 } { 4 } )$$

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