| 55 | x | = | 55 | × | 5 | + | 55 | ( | 55 | − | x | ) | + | 750 |
| 方程右边 = | 275 | + | 55 | ( | 55 | − | x | ) | + | 750 |
| = | 1025 | + | 55 | ( | 55 | − | x | ) |
| 55 | x | = | 1025 | + | 55 | ( | 55 | − | x | ) |
| 方程右边 = | 1025 | + | 55 | × | 55 | − | 55 | x |
| = | 1025 | + | 3025 | − | 55 | x |
| = | 4050 | − | 55 | x |
| 55 | x | = | 4050 | − | 55 | x |
| 55 | x | + | 55 | x | = | 4050 |
| 110 | x | = | 4050 |
| x | = | 4050 | ÷ | 110 |
| = | 4050 | × | 1 110 |
| = | 405 | × | 1 11 |
| x | = | 405 11 |
| x | = | 36.818182 |