Example

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

Question

$${ \left(x-y \right) }^{ 3 } - { \left(z-y \right) }^{ 3 } -3(x-z)(x-y)(z-y)$$

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