Example

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

Question

$$\frac{ -3 }{ 5 } + \frac{ 4 }{ 9 } + \frac{ -3 }{ 15 } + \frac{ -7 }{ 12 }$$

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