Example

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

Question

$$- 6 - 2 \{ 3 x y - x ( y + 7 ) + 4 x - 3 - 4 ( 2 x + 5 ) \}$$

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