Example

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

Question

$$(4 { x }^{ 2 } -1) \times (4 { x }^{ 2 } -1)-(6 { x }^{ 2 } +x+1)$$

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