Example

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

Question

$$\frac{ 2 }{ 5 } + \frac{ 3 }{ 4 } +(- \frac{ 2 }{ 20 } )+(- \frac{ 4 }{ 10 } )$$

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