Example

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

Question

$$( \frac{ -3 }{ 4 } + \frac{ 5 }{ -4 } )+( \frac{ -4 }{ 5 } + \frac{ 4 }{ -5 } )$$

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