Example

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

Question

$$[ ( - 3 ) \times [ ( - 4 ) - ( 1 ) ] - ( - 3 ) \times ( - 1 ) ] - ( ( - 3 ) \times ( 1 ) ]$$

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