Example

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

Question

$$4.2 \times 13.5-8.7 \times 4.2-5.8 \times 8.7+13.5 \times 5.8$$

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