| ( | x | + | 3 | ) | ÷ | ( | x | − | 3 | ) | − | 4 | ÷ | ( | x | + | 3 | ) | = | 1 |
| 方程两边同时乘以: | ( | x | − | 3 | ) |
| ( | x | + | 3 | ) | − | 4 | ÷ | ( | x | + | 3 | ) | × | ( | x | − | 3 | ) | = | 1 | ( | x | − | 3 | ) |
| x | + | 3 | − | 4 | ÷ | ( | x | + | 3 | ) | × | ( | x | − | 3 | ) | = | 1 | ( | x | − | 3 | ) |
| x | + | 3 | − | 4 | ÷ | ( | x | + | 3 | ) | × | ( | x | − | 3 | ) | = | 1 | x | − | 1 | × | 3 |
| x | + | 3 | − | 4 | ÷ | ( | x | + | 3 | ) | × | ( | x | − | 3 | ) | = | 1 | x | − | 3 |
| 方程两边同时乘以: | ( | x | + | 3 | ) |
| x | ( | x | + | 3 | ) | + | 3 | ( | x | + | 3 | ) | − | 4 | ( | x | − | 3 | ) | = | 1 | x | ( | x | + | 3 | ) | − | 3 | ( | x | + | 3 | ) |
| x | x | + | x | × | 3 | + | 3 | ( | x | + | 3 | ) | − | 4 | ( | x | − | 3 | ) | = | 1 | x | ( | x | + | 3 | ) | − | 3 | ( | x | + | 3 | ) |
| x | x | + | x | × | 3 | + | 3 | ( | x | + | 3 | ) | − | 4 | ( | x | − | 3 | ) | = | 1 | x | x | + | 1 | x | × | 3 | − | 3 | ( | x | + | 3 | ) |
| x | x | + | x | × | 3 | + | 3 | ( | x | + | 3 | ) | − | 4 | ( | x | − | 3 | ) | = | 1 | x | x | + | 3 | x | − | 3 | ( | x | + | 3 | ) |
| x | x | + | 3 | x | + | 3 | x | + | 3 | × | 3 | − | 4 | ( | x | − | 3 | ) | = | 1 | x | x | + | 3 | x | − | 3 | ( | x | + | 3 | ) |
| x | x | + | 3 | x | + | 3 | x | + | 3 | × | 3 | − | 4 | ( | x | − | 3 | ) | = | 1 | x | x | + | 3 | x | − | 3 | x | − | 3 | × | 3 |
| x | x | + | 3 | x | + | 3 | x | + | 9 | − | 4 | ( | x | − | 3 | ) | = | 1 | x | x | + | 3 | x | − | 3 | x | − | 9 |
| x | x | + | 6 | x | + | 9 | − | 4 | ( | x | − | 3 | ) | = | 1 | x | x | + | 0 | x | − | 9 |
| x | x | + | 6 | x | + | 9 | − | 4 | x | + | 4 | × | 3 | = | 1 | x | x | − | 9 |
| x | x | + | 6 | x | + | 9 | − | 4 | x | + | 12 | = | 1 | x | x | − | 9 |
| x | x | + | 2 | x | + | 21 | = | 1 | x | x | − | 9 |