Example

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

Question

$$6-\{1\frac{1}{2}-\frac{3}{5}\times(1\frac{7}{9}-\frac{1}{2})\}$$

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