| 0 | = | 3 | ( | x | + | 2 | ) | ( | x | − | 3 | ) | ( | x | + | 4 | ) | + | x |
| 方程右边 = | 3 | x | ( | x | − | 3 | ) | ( | x | + | 4 | ) | + | 3 | × | 2 | ( | x | − | 3 | ) | ( | x | + | 4 | ) | + | x |
| = | 3 | x | ( | x | − | 3 | ) | ( | x | + | 4 | ) | + | 6 | ( | x | − | 3 | ) | ( | x | + | 4 | ) | + | x |
| = | 3 | x | x | ( | x | + | 4 | ) | − | 3 | x | × | 3 | ( | x | + | 4 | ) | + | 6 | ( | x | − | 3 | ) | ( | x | + | 4 | ) | + | x |
| = | 3 | x | x | ( | x | + | 4 | ) | − | 9 | x | ( | x | + | 4 | ) | + | 6 | ( | x | − | 3 | ) | ( | x | + | 4 | ) | + | x |
| = | 3 | x | x | x | + | 3 | x | x | × | 4 | − | 9 | x | ( | x | + | 4 | ) | + | 6 |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | ( | x | + | 4 | ) | + | 6 | ( | x | − | 3 | ) |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 9 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 36 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 35 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 35 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 35 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 35 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 35 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 11 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 11 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 11 | x |
| = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 29 | x |
| 0 | = | 3 | x | x | x | + | 12 | x | x | − | 9 | x | x | − | 29 | x |