Example

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

Question

$$( \frac{ 1 }{ 2 } + \frac{ 2 }{ 9 } )- \frac{ 4 }{ 15 } + \frac{ 5 }{ 18 }$$

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