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b) 2a(4x+y)-(y+4x)a=2a(4x+y)-(4x+y)a=(4x+y)(2a-a)=(4x+y)a
c) 3x(3a-2b)+5x(3a-2b)=(3a-2b)(3x+5x)=(3a-2b)8x
d) 14x(a-4b)-(a-4b)=(a-4b)(14x-1)
e) 8x(3b-a)+6x(3b-a)-(3b-a)=(3b-a) (8x-6x-1)=(3b-a)(2x-1)
f) (3x+2y)+2(2y+3x)+(3x+2y)=(3x+2y)+2(3x+2y)+(3x+2y)=
=(3x+2y)(1+2+1)=(3x+2y)4