Example

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

Question

$$(-\frac{2}{5}+\frac{4}{9})+(-\frac{3}{4})=-\frac{2}{5}+\{\frac{4}{9}+(-\frac{3}{4})\}$$

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