Example

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

Question

$$( { \left(1/2 \right) }^{ 2 } +3/2) \times - { \left(1/2-1/4 \right) }^{ 2 }$$

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