3a(x-y)-6b(y-x)

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3a(x-y)-6b(y-x)
3a(x-y)-6b(y-x)

3a(x-y)-6b(y-x)
3a(x-y)-6b(y-x)
=3a(x-y)+6b(x-y)
=(3a+6b)(x-y)
=3(a+2b)(x-y)