Example

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

Question

$$3(1 \times 1-(-2) \times 3)-(-4)(1 \times 1-(-2) \times 2)+5(1 \times 3-1 \times 2)$$

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