а²-а-b²-b=(a-b)(a+b)-(a+b)=(a+b)(a-b-1)
y²+yx-zx-z²=(y-z)(y+z)+x(y-z)=(y-z)(y+z+x)
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а²-а-b²-b=(a-b)(a+b)-(a+b)=(a+b)(a-b-1)
y²+yx-zx-z²=(y-z)(y+z)+x(y-z)=(y-z)(y+z+x)