Example

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

Question

$$40 - 2 \times 5 + 5 - 9 \div 4 \frac { 15 } { 2 } = ?$$

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