Example

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

Question

$$4 \frac{ 1 }{ 3 } - \{ \frac{ 17 }{ 4 } -( \frac{ 81 }{ 4 } \times \frac{ 28 }{ 27 } ) \}$$

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