Example

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

Question

$$4\frac{1}{4}+18\frac{1}{8}+4\frac{3}{8}-(\frac{1}{2}\div\frac{7}{12}\times2\frac{1}{3})$$

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