| 10 | X | + | ( | X | − | 6 | ) | × | 10 | ( | X | − | 6 | ) | + | X | = | 0 |
| 方程左边 = | 11 | X | + | ( | X | − | 6 | ) | × | 10 | ( | X | − | 6 | ) |
| 11 | X | + | ( | X | − | 6 | ) | × | 10 | ( | X | − | 6 | ) | = | 0 |
| 方程左边 = | 11 | X | + | X | × | 10 | ( | X | − | 6 | ) | − | 6 | × | 10 | ( | X | − | 6 | ) |
| = | 11 | X | + | X | × | 10 | ( | X | − | 6 | ) | − | 60 | ( | X | − | 6 | ) |
| = | 11 | X | + | X | × | 10 | X | − | X | × | 10 | × | 6 | − | 60 | ( | X | − | 6 | ) |
| = | 11 | X | + | X | × | 10 | X | − | X | × | 60 | − | 60 | ( | X | − | 6 | ) |
| = | - | 49 | X | + | X | × | 10 | X | − | 60 | ( | X | − | 6 | ) |
| = | - | 49 | X | + | X | × | 10 | X | − | 60 | X | + | 60 | × | 6 |
| = | - | 49 | X | + | X | × | 10 | X | − | 60 | X | + | 360 |
| = | - | 109 | X | + | X | × | 10 | X | + | 360 |
| - | 109 | X | + | X | × | 10 | X | + | 360 | = | 0 |