Example

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

Question

$$4\frac{1}{2}-\{\{r-\frac{1}{4}\times2\frac{1}{2})-\frac{12}{4}\}$$

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