Example

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

Question

$${ \left( \frac{ 5 }{ 4 } \right) }^{ -7 \times { \left( \frac{ 8 }{ 5 } \right) }^{ -1 } }$$

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