Example

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

Question

$${ \left( \frac{ -1 }{ 2 } \right) }^{ 2 } -8( \frac{ -1 }{ 2 } )+12$$

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