x² - 7x - 18 = 0
                        ( -2 )

x² + x - 20 = 0
                        (    )

x² - 2x - 15 = 0
                        (    )

x² + 4x - 12 = 0
                        (    )

x² - 2x - 63 = 0
                        (    )

x² + 4x - 12 = 0
                        (    )

x² + 6x - 27 = 0
                        (    )

x² + 2x - 63 = 0
                        (    )

x² + 10x + 24 = 0
                        (    )

x² + 6x - 27 = 0
                        (    )

                      +[    ]

x² - 36 = 0
                        (    )

x² + 3x - 40 = 0
                        (    )

x² - 25 = 0
                        (    )

x² - 49 = 0
                        (    )

x² - 11x + 30 = 0
                        (    )

x² - 9x + 18 = 0
                        (    )

x² - 5x - 14 = 0
                        (    )

x² - 64 = 0
                        (    )

x² - 8x + 12 = 0
                        (    )

x² + 11x + 18 = 0
                        (    )

                      +[    ]

x² - 12x + 35 = 0
                        (    )

x² + 6x - 27 = 0
                        (    )

x² - 5x - 14 = 0
                        (    )

x² + 12x + 27 = 0
                        (    )

x² + 2x - 48 = 0
                        (    )

x² - 2x - 48 = 0
                        (    )

x² + 12x + 32 = 0
                        (    )

x² - 13x + 42 = 0
                        (    )

x² + x - 20 = 0
                        (    )

x² - 2x - 35 = 0
                        (    )

                      +[    ]
                 +++[[       ]]