Example

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

Question

$$\frac{ 71 }{ 3 } - \frac{ 21 }{ 4 } ( \frac{ 21 }{ 5 } \times \frac{ 3 }{ 4 } )$$

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