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(3xa - 4ya + 9za) + (12by - 9xb - 27zb) =
a(3x - 4y + 9z) + 3b(4y - 3x - 9z) =
a(3x - 4y + 9z) - 3b(3x - 4y + 9z) =
(3x - 4y + 9z) (a - 3b)