Example

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

Question

$$\frac{1}{2}+1\frac{1}{2}\div1\frac{1}{2}\times\frac{2}{3}-\frac{1}{4}$$

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