Example

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

Question

$${ \left(2a \right) }^{ 2 } -4 \times 1 \times -(4 { b }^{ 2 } - { a }^{ 2 } )$$

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