Example

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

Question

$$(\frac{7}{2}\times\frac{-3}{5})-\frac{5}{4}-\frac{13}{2}\times\frac{13}{5}$$

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