Example

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

Question

$$\frac{ 1 }{ 4 } + \frac{ 2 }{ 4 } + \frac{ 9 }{ 10 } + \frac{ 5 }{ 10 } =$$

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