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= (x-5)(x-2)
3. 3xa-9xb-4ya+12yb+9za-27zb
=(3xa-9xb)-(4ya+12yb)+(9za-27zb)
= 3x(a-3b)-4y(a+3b)+9z(a-3b)
=(3x-4y+9z)(a-3b)
Espero que te sirva ;D