Example

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

Question

$$8 \times { \left(x-1 \right) }^{ 3 } -27 \times { \left(x+2 \right) }^{ 3 }$$

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