Example

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

Question

$$2\frac{2}{3}:1\frac{1}{7}\cdot3\frac{3}{7}\cdot(-\frac{1}{2})$$

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