Example

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

Question

$${ a }^{ 4 } -81, { a }^{ 2 } -9 { a }^{ 2 } , { a }^{ 2 } +18a+81$$

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