| ( | x | + | 3 | ) | ( | x | + | 2 | ) | ( | 4 | − | x | ) | + | 3 | + | x | + | 16 | − | 4 | x | = | 0 |
| 方程左边 = | ( | x | + | 3 | ) | ( | x | + | 2 | ) | ( | 4 | − | x | ) | + | 19 | − | 3 | x |
| ( | x | + | 3 | ) | ( | x | + | 2 | ) | ( | 4 | − | x | ) | + | 19 | − | 3 | x | = | 0 |
| 方程左边 = | x | ( | x | + | 2 | ) | ( | 4 | − | x | ) | + | 3 | ( | x | + | 2 | ) | ( | 4 | − | x | ) | + | 19 | − | 3 | x |
| = | x | x | ( | 4 | − | x | ) | + | x | × | 2 | ( | 4 | − | x | ) | + | 3 | ( | x | + | 2 | ) | ( | 4 | − | x | ) | + | 19 | − | 3 | x |
| = | x | x | × | 4 | − | x | x | x | + | x | × | 2 | ( | 4 | − | x | ) | + | 3 | ( | x | + | 2 | ) | ( | 4 | − | x | ) |
| = | x | x | × | 4 | − | x | x | x | + | x | × | 2 | × | 4 | − | x | × | 2 | x |
| = | x | x | × | 4 | − | x | x | x | + | x | × | 8 | − | x | × | 2 | x | + | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 5 | x | − | x | × | 2 | x | + | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 5 | x | − | x | × | 2 | x | + | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 5 | x | − | x | × | 2 | x | + | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 5 | x | − | x | × | 2 | x | + | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 5 | x | − | x | × | 2 | x | + | 12 |
| = | x | x | × | 4 | − | x | x | x | + | 17 | x | − | x | × | 2 | x | − | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 17 | x | − | x | × | 2 | x | − | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 17 | x | − | x | × | 2 | x | − | 3 |
| = | x | x | × | 4 | − | x | x | x | + | 11 | x | − | x | × | 2 | x | − | 3 |
| x | x | × | 4 | − | x | x | x | + | 11 | x | − | x | × | 2 | x | − | 3 | = | 0 |