Example

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

Question

$$14 + \{ \frac { 9 } { 21 } \div ( \frac { 4 } { 5 } - \frac { 2 } { 3 } ) - 6 \}$$

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