| 99 | + | ( | 99 | − | ( | 99 | + | ( | 99 | − | x | + | 26 | ) | ÷ | 3 | ) | + | 26 | ) | ÷ | 3 | = | x |
| 方程左边 = | 99 | + | 99 | × | 1 3 | − | ( | 99 | + | ( | 99 | − | x | + | 26 | ) | ÷ | 3 | ) | × | 1 3 | + | 26 | × | 1 3 |
| = | 99 | + | 33 | − | ( | 99 | + | ( | 99 | − | x | + | 26 | ) | ÷ | 3 | ) | × | 1 3 | + | 26 3 |
| = | 422 3 | − | ( | 99 | + | ( | 99 | − | x | + | 26 | ) | ÷ | 3 | ) | × | 1 3 |
| = | 422 3 | − | 99 | × | 1 3 | − | ( | 99 | − | x | + | 26 | ) | ÷ | 3 | × | 1 3 |
| = | 422 3 | − | 33 | − | ( | 99 | − | x | + | 26 | ) | × | 1 9 |
| = | 323 3 | − | ( | 99 | − | x | + | 26 | ) | × | 1 9 |
| = | 323 3 | − | 99 | × | 1 9 | + | x | × | 1 9 | − | 26 | × | 1 9 |
| = | 323 3 | − | 11 | + | x | × | 1 9 | − | 26 9 |
| = | 844 9 | + | 1 9 | x |
844 9 | + | 1 9 | x | = | x |
1 9 | x | − | x | = | - | 844 9 |
| - | 8 9 | x | = | - | 844 9 |
844 9 | = | 8 9 | x |
8 9 | x | = | 844 9 |
| x | = | 844 9 | ÷ | 8 9 |
| = | 844 9 | × | 9 8 |
| = | 211 | × | 1 2 |
| x | = | 211 2 |
| x | = | 105.5 |