A=4x+12
=4(x+3)
B=6x-15
=3(2x-5)
C=21x-7
=7(3x-1)
D=4-10x
=2(2-5x)
E=9x^2+6
=3(3x^2+2)
F=x^2-4x
=x(x-4)
G=2x+2
=2(x+1)
H=x^2+x
=x(x+1)
I=4x^2+3x^2
=7x^2
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A=4x+12
=4(x+3)
B=6x-15
=3(2x-5)
C=21x-7
=7(3x-1)
D=4-10x
=2(2-5x)
E=9x^2+6
=3(3x^2+2)
F=x^2-4x
=x(x-4)
G=2x+2
=2(x+1)
H=x^2+x
=x(x+1)
I=4x^2+3x^2
=7x^2