Example

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

Question

$$\frac{ 2 { r }^{ 2 } }{ rs- { s }^{ 2 } } \times \frac{ 5r-5s }{ 2r-4 { r }^{ 2 } }$$

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