3 4 | ( | x | + | 3 | ) | ( | x | − | 1 | ) | = | 0 |
| 方程左边 = | 3 4 | x | ( | x | − | 1 | ) | + | 3 4 | × | 3 | ( | x | − | 1 | ) |
| = | 3 4 | x | ( | x | − | 1 | ) | + | 9 4 | ( | x | − | 1 | ) |
| = | 3 4 | x | x | − | 3 4 | x | × | 1 | + | 9 4 | ( | x | − | 1 | ) |
| = | 3 4 | x | x | − | 3 4 | x | + | 9 4 | ( | x | − | 1 | ) |
| = | 3 4 | x | x | − | 3 4 | x | + | 9 4 | x | − | 9 4 | × | 1 |
| = | 3 4 | x | x | − | 3 4 | x | + | 9 4 | x | − | 9 4 |
| = | 3 4 | x | x | + | 3 2 | x | − | 9 4 |
3 4 | x | x | + | 3 2 | x | − | 9 4 | = | 0 |