Example

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

Question

$$( 02 \times 3 ^ { 3 } \div 9 ) - 2 \times ( 6 + 8 ) \div 7$$

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