x² + 3x - 28 = 0
                        ( -7 )

x² - x - 72 = 0
                        (    )

x² - 3x - 10 = 0
                        (    )

x² - 7x - 18 = 0
                        (    )

x² + 9x + 20 = 0
                        (    )

x² - 15x + 54 = 0
                        (    )

x² - 10x + 24 = 0
                        (    )

x² - 10x + 24 = 0
                        (    )

x² + 12x + 32 = 0
                        (    )

x² - 13x + 42 = 0
                        (    )

                      +[    ]

x² + 14x + 49 = 0
                        (    )

x² + 2x - 48 = 0
                        (    )

x² - 14x + 45 = 0
                        (    )

x² - 16 = 0
                        (    )

x² - x - 30 = 0
                        (    )

x² - 6x - 16 = 0
                        (    )

x² + 11x + 18 = 0
                        (    )

x² + 14x + 45 = 0
                        (    )

x² + 7x - 18 = 0
                        (    )

x² - x - 30 = 0
                        (    )

                      +[    ]

x² - 25 = 0
                        (    )

x² - 11x + 24 = 0
                        (    )

x² + 10x + 21 = 0
                        (    )

x² + 4x - 45 = 0
                        (    )

x² - 2x - 8 = 0
                        (    )

x² - 3x - 40 = 0
                        (    )

x² + 5x - 24 = 0
                        (    )

x² + x - 12 = 0
                        (    )

x² - x - 72 = 0
                        (    )

x² + 3x - 40 = 0
                        (    )

                      +[    ]
                 +++[[       ]]