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