Example

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

Question

$$(x+2y)(x-2y)+(9 { x }^{ 2 } +4 { y }^{ 2 } )+5 { y }^{ 2 }$$

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