5а(3а-8) - 3b(3a-8) + 9ab(3a-8) - (3a-8)= (3а-8)(5а - 3b + 9ab - 1)
7y(7x-y) + x(7x-y) - 7xy (7x-y) + (7x-y)=(7x-y)(7y + x - 7xy + 1)
5а(3а-8) - 3b(3a-8) + 9ab(3a-8) - (3a-8)= (3а-8)(5а - 3b + 9ab - 1)
7y(7x-y) + x(7x-y) - 7xy (7x-y) + (7x-y)=(7x-y)(7y + x - 7xy + 1)