Example

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

Question

$$\frac{ 6 }{ 66 } \left\{\begin{matrix} \frac{ 26 }{ 63 } \\ \end{matrix}\right. -5$$

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