| 7 | x | − | 196 | − | ( | 7 | x | − | 11689 25 | ) | × | 1 4 | = | 260 | + | 441 5 |
| 方程左边 = | 7 | x | − | 196 | − | 7 | x | × | 1 4 | + | 11689 25 | × | 1 4 |
| = | 7 | x | − | 196 | − | 7 4 | x | + | 11689 100 |
| = | 21 4 | x | − | 7911 100 |
21 4 | x | − | 7911 100 | = | 260 | + | 441 5 |
| 方程右边 = | 1741 5 |
21 4 | x | − | 7911 100 | = | 1741 5 |
21 4 | x | = | 1741 5 | + | 7911 100 |
21 4 | x | = | 42731 100 |
| x | = | 42731 100 | ÷ | 21 4 |
| = | 42731 100 | × | 4 21 |
| = | 42731 25 | × | 1 21 |
| x | = | 42731 525 |
| x | = | 81.392381 |