Example

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

Question

$$-4( { x }^{ 3 } +8x-1)-(8 { x }^{ 3 } - { x }^{ 2 } -7)(- { x }^{ 2 } +5x+9)$$

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