Example

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

Question

$$(7 \times 6) \div 2[ \{ 45 \div 3(7 \times 2-15+6) \} +4]$$

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