Example

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

Question

$$16 \div 3+5 \div 7 \times 2+4 \times 6-3 \times 12 \div 2+4 \div 9+7$$

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