Example

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

Question

$$(-2+4 { n }^{ 2 } + { n }^{ 4 } )+(-6 { n }^{ 3 } -8-2 { n }^{ 2 } )$$

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