| X | + | X | ÷ | 9 | = | X | + | 3 | + | ( | X | + | 3 | ) | ÷ | 24 |
| 方程左边 = | 10 9 | X |
10 9 | X | = | X | + | 3 | + | ( | X | + | 3 | ) | ÷ | 24 |
| 方程右边 = | X | + | 3 | + | X | × | 1 24 | + | 3 | × | 1 24 |
| = | X | + | 3 | + | X | × | 1 24 | + | 1 8 |
| = | 25 24 | X | + | 25 8 |
10 9 | X | = | 25 24 | X | + | 25 8 |
10 9 | X | − | 25 24 | X | = | 25 8 |
5 72 | X | = | 25 8 |
| X | = | 25 8 | ÷ | 5 72 |
| = | 25 8 | × | 72 5 |
| = | 5 | × | 9 |
| X | = | 45 |