a = (x-2)(x+8+6x) =(x-2)(7x+8)
b = ( 2y+6)(2y+6-4y-1)=(2y+6)(-2y+5)
c =(x-1)(x-1+4-3x)=(x-1)(-2x+3)
d =(x-4)(x+4) +(x-4)(6x+3)=(x-4)(x+4+6x+3)=(x-4)(7x+7)
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a = (x-2)(x+8+6x) =(x-2)(7x+8)
b = ( 2y+6)(2y+6-4y-1)=(2y+6)(-2y+5)
c =(x-1)(x-1+4-3x)=(x-1)(-2x+3)
d =(x-4)(x+4) +(x-4)(6x+3)=(x-4)(x+4+6x+3)=(x-4)(7x+7)