12m2n-9mn2
Factor 3mn out of 12m2n.
3mn(4m)-9mn2
Factor 3mn out of -9mn2.
3mn(4m)+3mn(-3n)
Factor 3mn out of 3mn(4m)+3mn(-3n).
3mn(4m-3n)
Factor 12m^2n-9mn^2
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