Example

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

Question

$${ x }^{ 7 } -20 { x }^{ 5 } -2 { x }^{ 4 } +64 { x }^{ 3 } +40 { x }^{ 2 } -128$$

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