Example

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

Question

$$( \frac { - 1 } { 4 } - \frac { - 9 } { 16 } ) \div ( \frac { 5 } { 12 } - \frac { 7 } { 8 } )$$

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