| ( | x | − | 4 | ) | ( | ( | x | − | 14 | ) | ( | x | + | 11 | ) | − | 28 | x | − | 49 | ) | + | 68 | x | + | 156 | = | 0 |
| 方程左边 = | x | ( | ( | x | − | 14 | ) | ( | x | + | 11 | ) | − | 28 | x | − | 49 | ) | − | 4 | ( | ( | x | − | 14 | ) | ( | x | + | 11 | ) | − | 28 | x | − | 49 | ) | + | 68 | x | + | 156 |
| = | x | ( | x | − | 14 | ) | ( | x | + | 11 | ) | − | x | × | 28 | x | − | x | × | 49 | − | 4 | ( | ( | x | − | 14 | ) | ( | x | + | 11 | ) | − | 28 | x | − | 49 | ) | + | 68 | x |
| = | x | ( | x | − | 14 | ) | ( | x | + | 11 | ) | − | x | × | 28 | x | + | 19 | x | − | 4 | ( | ( | x | − | 14 | ) | ( | x | + | 11 | ) | − | 28 | x | − | 49 | ) | + | 156 |
| = | x | x | ( | x | + | 11 | ) | − | x | × | 14 | ( | x | + | 11 | ) | − | x | × | 28 | x | + | 19 | x | − | 4 |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | ( | x | + | 11 | ) | − | x | × | 28 | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | x | × | 14 | × | 11 |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | x | × | 154 | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 135 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 135 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 135 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 23 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 23 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 23 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 23 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 23 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 67 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 67 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 67 | x | − | x |
| = | x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 11 | x | − | x |
| x | x | x | + | x | x | × | 11 | − | x | × | 14 | x | − | 11 | x | − | x | = | 0 |