Example

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

Question

$$- 13 + ( - 4 ) \div 2 - 3 [ - \{ ( - 3 ) \times ( - 7 ) - ( 3 + 5 ) \} ]$$

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