Example

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

Question

$$\frac{3}{4}-\frac{3}{5}-\frac{2}{3}+\frac{5}{8}-\frac{4}{15}$$

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