Example

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

Question

$$\{ -2-[ \frac{ 7 }{ 9 } + \frac{ 3 }{ 4 } \times (1- \frac{ 5 }{ 6 } )] \}$$

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