Example

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

Question

$$\quad \frac { 2 } { 3 } ( \frac { 1 } { 7 } \div \frac { 3 } { 8 } - \frac { 5 } { 21 } )$$

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