| ( | x | − | 2 | ) | ( | x | + | 3 | ) | ÷ | ( | x | − | 4 | ) | × | ( | x | + | 5 | ) | = | 0 |
| 方程两边同时乘以: | ( | x | − | 4 | ) |
| ( | x | − | 2 | ) | ( | x | + | 3 | ) | ( | x | + | 5 | ) | = | 0 |
| x | ( | x | + | 3 | ) | ( | x | + | 5 | ) | − | 2 | ( | x | + | 3 | ) | ( | x | + | 5 | ) | = | 0 |
| x | x | ( | x | + | 5 | ) | + | x | × | 3 | ( | x | + | 5 | ) | − | 2 | ( | x | + | 3 | ) | ( | x | + | 5 | ) | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | ( | x | + | 5 | ) | − | 2 | ( | x | + | 3 | ) | ( | x | + | 5 | ) | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | x | × | 3 | × | 5 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | x | × | 15 | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 15 | x | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 5 | x | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 5 | x | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | + | 5 | x | − | 2 | = | 0 |
| x | x | x | + | x | x | × | 5 | + | x | × | 3 | x | − | 1 | x | − | 2 | = | 0 |