2х(а-b)+a(a-b)=
(2х+а)(а-b)
3x+3y-bx-by=
3(x+y)-b(x+y)=
(3-b)(x+y)
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2х(а-b)+a(a-b)=
(2х+а)(а-b)
3x+3y-bx-by=
3(x+y)-b(x+y)=
(3-b)(x+y)