Example

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

Question

$${ x }^{ 2 } + \frac{ 1 }{ { x }^{ 2 } } =18, { x }^{ 3 } + \frac{ 1 }{ { x }^{ 3 } } =$$

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