Example

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

Question

$$25 \times 16 \div (60 \div 15)-4 \times (77-62) \div (20 \times 6 \div 3)$$

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