| ( | X | − | 160 | ) | × | 25 2 | = | ( | X | − | 100 | ) | ÷ | 4 |
| 方程左边 = | X | × | 25 2 | − | 160 | × | 25 2 |
| = | X | × | 25 2 | − | 2000 |
25 2 | X | − | 2000 | = | ( | X | − | 100 | ) | ÷ | 4 |
| 方程右边 = | X | × | 1 4 | − | 100 | × | 1 4 |
| = | X | × | 1 4 | − | 25 |
25 2 | X | − | 2000 | = | 1 4 | X | − | 25 |
25 2 | X | − | 1 4 | X | = | - | 25 | + | 2000 |
49 4 | X | = | - | 25 | + | 2000 |
49 4 | X | = | 1975 |
| X | = | 1975 | ÷ | 49 4 |
| = | 1975 | × | 4 49 |
| X | = | 7900 49 |
| X | = | 161.22449 |