Example

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

Question

$$- { \left( \frac{ 1 }{ 2 } \right) }^{ 2 } \frac{ 4 }{ 5 } - \frac{ 8 }{ 9 } ( \frac{ 3 }{ 4 } )$$

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