| ( | X | + | 500 | ÷ | 12 | ) | × | 84 | + | 301 | X | + | ( | X | − | 300 | ÷ | 12 | ) | × | 48 | = | 383025 |
| 方程左边 = | X | × | 84 | + | 500 | ÷ | 12 | × | 84 | + | 301 | X | + | ( | X | − | 300 | ÷ | 12 | ) | × | 48 |
| = | X | × | 84 | + | 3500 | + | 301 | X | + | ( | X | − | 300 | ÷ | 12 | ) | × | 48 |
| = | 385 | X | + | 3500 | + | ( | X | − | 300 | ÷ | 12 | ) | × | 48 |
| = | 385 | X | + | 3500 | + | X | × | 48 | − | 300 | ÷ | 12 | × | 48 |
| = | 385 | X | + | 3500 | + | X | × | 48 | − | 1200 |
| = | 433 | X | + | 2300 |
| 433 | X | + | 2300 | = | 383025 |
| 433 | X | = | 383025 | − | 2300 |
| 433 | X | = | 380725 |
| X | = | 380725 | ÷ | 433 |
| = | 380725 | × | 1 433 |
| X | = | 380725 433 |
| X | = | 879.272517 |