| ( | x | + | 23 10 | ) | ( | 10 | x | − | 3 | ) | = | 0 |
| 方程左边 = | x | ( | 10 | x | − | 3 | ) | + | 23 10 | ( | 10 | x | − | 3 | ) |
| = | x | × | 10 | x | − | x | × | 3 | + | 23 10 | ( | 10 | x | − | 3 | ) |
| = | x | × | 10 | x | − | 3 | x | + | 23 10 | × | 10 | x | − | 23 10 | × | 3 |
| = | x | × | 10 | x | − | 3 | x | + | 23 | x | − | 69 10 |
| = | x | × | 10 | x | + | 20 | x | − | 69 10 |
| x | × | 10 | x | + | 20 | x | − | 69 10 | = | 0 |
| x1= | - | 23 10 |
| x2= | 3 10 |