Example

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

Question

$$(x-y)^{2}+(y+z)^{2}+(z-x)^{2}(x-y)(y-z)(z-x)=$$

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