| ( | 441 5 | + | ( | 7 | x | − | 11689 25 | ) | + | 4584 25 | ) | − | ( | ( | 7 | x | − | 11689 25 | ) | × | 1 4 | ) | = | 0 |
| 方程左边 = | 441 5 | + | ( | 7 | x | − | 11689 25 | ) | + | 4584 25 | − | ( | ( | 7 | x | − | 11689 25 | ) | × | 1 4 | ) |
| = | 6789 25 | + | ( | 7 | x | − | 11689 25 | ) | − | ( | ( | 7 | x | − | 11689 25 | ) | × | 1 4 | ) |
| = | 6789 25 | + | 7 | x | − | 11689 25 | − | ( | ( | 7 | x | − | 11689 25 | ) | × | 1 4 | ) |
| = | - | 196 | + | 7 | x | − | ( | ( | 7 | x | − | 11689 25 | ) | × | 1 4 | ) |
| = | - | 196 | + | 7 | x | − | ( | 7 | x | − | 11689 25 | ) | × | 1 4 |
| = | - | 196 | + | 7 | x | − | 7 | x | × | 1 4 | + | 11689 25 | × | 1 4 |
| = | - | 196 | + | 7 | x | − | 7 4 | x | + | 11689 100 |
| = | - | 7911 100 | + | 21 4 | x |
| - | 7911 100 | + | 21 4 | x | = | 0 |
21 4 | x | = | 0 | + | 7911 100 |
21 4 | x | = | 7911 100 |
| x | = | 7911 100 | ÷ | 21 4 |
| = | 7911 100 | × | 4 21 |
| = | 2637 25 | × | 1 7 |
| x | = | 2637 175 |
| x | = | 15.068571 |