Example

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

Question

$$1(1 \times 2-1 \times 1)-2(2 \times 2-1 \times 1)+3(2 \times 1-1 \times 1)$$

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