| ( | 1 | ÷ | 2 | × | ( | X | − | 1 | ) | ) | − | ( | 2 5 | ( | X | − | 6 | ) | ) | = | 1 2 |
| 方程左边 = | 1 | ÷ | 2 | × | ( | X | − | 1 | ) | − | ( | 2 5 | ( | X | − | 6 | ) | ) |
| = | 1 2 | ( | X | − | 1 | ) | − | ( | 2 5 | ( | X | − | 6 | ) | ) |
| = | 1 2 | X | − | 1 2 | × | 1 | − | ( | 2 5 | ( | X | − | 6 | ) | ) |
| = | 1 2 | X | − | 1 2 | − | ( | 2 5 | ( | X | − | 6 | ) | ) |
| = | 1 2 | X | − | 1 2 | − | 2 5 | ( | X | − | 6 | ) |
| = | 1 2 | X | − | 1 2 | − | 2 5 | X | + | 2 5 | × | 6 |
| = | 1 2 | X | − | 1 2 | − | 2 5 | X | + | 12 5 |
| = | 1 10 | X | + | 19 10 |
1 10 | X | + | 19 10 | = | 1 2 |
1 10 | X | = | 1 2 | − | 19 10 |
1 10 | X | = | - | 7 5 |
| X | = | - | 7 5 | ÷ | 1 10 |
| = | - | 7 5 | × | 10 |
| = | - | 7 | × | 2 |
| X | = | - | 14 |