| 74 | × | 91 50 | − | x | = | x | − | 199 20 | − | 74 |
| 方程左边 = | 3367 25 | − | x |
3367 25 | − | x | = | x | − | 199 20 | − | 74 |
| 方程右边 = | x | − | 1679 20 |
3367 25 | − | x | = | x | − | 1679 20 |
| - | x | − | x | = | - | 1679 20 | − | 3367 25 |
| - | 2 | x | = | - | 1679 20 | − | 3367 25 |
| - | 2 | x | = | - | 21863 100 |
21863 100 | = | 2 | x |
| 2 | x | = | 21863 100 |
| x | = | 21863 100 | ÷ | 2 |
| = | 21863 100 | × | 1 2 |
| x | = | 21863 200 |
| x | = | 109.315 |