Example

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

Question

$$\frac{15}{56}\cdot1\frac{1}{7}:\frac{2}{15}\cdot24\frac{1}{2}:7\frac{1}{2}$$

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