Example

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

Question

$$(-2,5-1\frac{5}{6}):1\frac{4}{9}-3\frac{5}{9}\cdot(-2\frac{1}{4})$$

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