Example

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

Question

$$520=\frac{20}{2}\{2\times5+(20-1)\underline{-2}; =10810+(19)(\frac{-2}{2})15$$

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