6x(x-y)^2+3(y-x)^3
=6x(x-y)^2+3(y-x)(y-x)^2
=6x(x-y)^2-3(x-y)(x-y)^2
=[6x-3(x-y)](x-y)^2
=(6x-3x+3y)(x-y)^2
=(3x+3y)(x-y)^2
=3(x+y)(x-y)^2
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