Answer
GCF=3$x^{3}$
Work Step by Step
12$x^{3}$ ,-6$x^{4}$ ,3$x^{3}$
12$x^{3}$= 1*2*2*3*x*x*x
-6$x^{3}$ = -1*2*3*x*x*x
3$x^{3}$= 1*3*x*x*x
GCF = 3xxx=3$x^{3}$
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