| ( | X | + | 24 | ) | × | 10 | ÷ | 2 | − | ( | 24 | − | X | ) | × | 10 | ÷ | 2 | = | 0 |
| 方程左边 = | ( | X | + | 24 | ) | × | 5 | − | ( | 24 | − | X | ) | × | 5 |
| ( | X | + | 24 | ) | × | 5 | − | ( | 24 | − | X | ) | × | 5 | = | 0 |
| 方程左边 = | X | × | 5 | + | 24 | × | 5 | − | ( | 24 | − | X | ) | × | 5 |
| = | X | × | 5 | + | 120 | − | ( | 24 | − | X | ) | × | 5 |
| = | 5 | X | + | 120 | − | 24 | × | 5 | + | X | × | 5 |
| = | 5 | X | + | 120 | − | 120 | + | X | × | 5 |
| = | 10 | X | + | 0 |
| 10 | X | = | 0 |
| X | = | 0 | ÷ | 10 |
| = | 0 | × | 1 10 |
| X | = | 0 |