Example

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

Question

$$\frac{ 4 }{ 7 } - \frac{ -8 }{ 9 } - \frac{ -13 }{ 7 } + \frac{ 17 }{ 9 }$$

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