x² - 81 = 0
                        ( -9 )

x² - 14x + 48 = 0
                        (    )

x² + 2x - 35 = 0
                        (    )

x² - x - 12 = 0
                        (    )

x² + 14x + 45 = 0
                        (    )

x² - 2x - 24 = 0
                        (    )

x² + 6x - 16 = 0
                        (    )

x² + 12x + 32 = 0
                        (    )

x² - 5x - 24 = 0
                        (    )

x² - 11x + 18 = 0
                        (    )

                      +[    ]

x² + 7x + 10 = 0
                        (    )

x² + 18x + 81 = 0
                        (    )

x² - 5x - 14 = 0
                        (    )

x² - 3x - 40 = 0
                        (    )

x² - 4x - 45 = 0
                        (    )

x² + 5x - 24 = 0
                        (    )

x² - 16 = 0
                        (    )

x² + 14x + 45 = 0
                        (    )

x² - 15x + 54 = 0
                        (    )

x² - 17x + 72 = 0
                        (    )

                      +[    ]

x² - 15x + 56 = 0
                        (    )

x² + 4x - 21 = 0
                        (    )

x² - 49 = 0
                        (    )

x² - 11x + 30 = 0
                        (    )

x² - 2x - 8 = 0
                        (    )

x² + 7x + 10 = 0
                        (    )

x² - 4x - 32 = 0
                        (    )

x² - 4x - 21 = 0
                        (    )

x² + 7x + 10 = 0
                        (    )

x² + 5x - 36 = 0
                        (    )

                      +[    ]
                 +++[[       ]]