| ( | X | + | 1 | ) | ÷ | 2 | − | 1 | = | ( | 3 | X | − | 2 | ) | ÷ | 3 |
| 方程左边 = | X | × | 1 2 | + | 1 | × | 1 2 | − | 1 |
| = | X | × | 1 2 | + | 1 2 | − | 1 |
| = | 1 2 | X | − | 1 2 |
1 2 | X | − | 1 2 | = | ( | 3 | X | − | 2 | ) | ÷ | 3 |
| 方程右边 = | 3 | X | × | 1 3 | − | 2 | × | 1 3 |
| = | 1 | X | − | 2 3 |
1 2 | X | − | 1 2 | = | 1 | X | − | 2 3 |
1 2 | X | − | 1 | X | = | - | 2 3 | + | 1 2 |
| - | 1 2 | X | = | - | 2 3 | + | 1 2 |
| - | 1 2 | X | = | - | 1 6 |
1 6 | = | 1 2 | X |
1 2 | X | = | 1 6 |
| X | = | 1 6 | ÷ | 1 2 |
| = | 1 6 | × | 2 |
| = | 1 3 | × | 1 |
| X | = | 1 3 |
| X | = | 0.333333 |