Example

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

Question

$$\frac{ 729 { n }^{ 2 } \pm { p }^{ 4 } }{ 81n- { p }^{ 2 } }$$

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