| X | − | X | × | 13 200 | − | ( | X | + | 50000 | ) | × | 3 10000 | = | 50000 |
| 方程左边 = | 187 200 | X | − | ( | X | + | 50000 | ) | × | 3 10000 |
187 200 | X | − | ( | X | + | 50000 | ) | × | 3 10000 | = | 50000 |
| 方程左边 = | 187 200 | X | − | X | × | 3 10000 | − | 50000 | × | 3 10000 |
| = | 187 200 | X | − | X | × | 3 10000 | − | 15 |
| = | 9347 10000 | X | − | 15 |
9347 10000 | X | − | 15 | = | 50000 |
9347 10000 | X | = | 50000 | + | 15 |
9347 10000 | X | = | 50015 |
| X | = | 50015 | ÷ | 9347 10000 |
| = | 50015 | × | 10000 9347 |
| X | = | 500150000 9347 |
| X | = | 53509.14732 |