x² + 7x - 18 = 0
                        ( -9 )

x² - 12x + 27 = 0
                        (    )

x² + x - 42 = 0
                        (    )

x² + 12x + 35 = 0
                        (    )

x² + x - 56 = 0
                        (    )

x² - 9x + 14 = 0
                        (    )

x² + 13x + 40 = 0
                        (    )

x² + 6x + 9 = 0
                        (    )

x² + 2x - 15 = 0
                        (    )

x² - 7x + 12 = 0
                        (    )

                      +[    ]

x² - 9 = 0
                        (    )

x² - 2x - 63 = 0
                        (    )

x² - 49 = 0
                        (    )

x² + 3x - 28 = 0
                        (    )

x² + 17x + 72 = 0
                        (    )

x² + 2x - 8 = 0
                        (    )

x² + 8x + 15 = 0
                        (    )

x² - 11x + 18 = 0
                        (    )

x² - 16 = 0
                        (    )

x² + 11x + 30 = 0
                        (    )

                      +[    ]

x² - 16x + 64 = 0
                        (    )

x² - 11x + 24 = 0
                        (    )

x² - 4x - 21 = 0
                        (    )

x² - 4x - 32 = 0
                        (    )

x² - 5x - 36 = 0
                        (    )

x² - 9x + 18 = 0
                        (    )

x² + 8x + 15 = 0
                        (    )

x² - x - 30 = 0
                        (    )

x² + 3x - 10 = 0
                        (    )

x² - 2x - 48 = 0
                        (    )

                      +[    ]
                 +++[[       ]]