| X | − | ( | 3250 | + | X | − | 10000 | ) | × | 3 100 | = | 19000 |
| 方程左边 = | X | − | 3250 | × | 3 100 | − | X | × | 3 100 | + | 10000 | × | 3 100 |
| = | X | − | 195 2 | − | X | × | 3 100 | + | 300 |
| = | 97 100 | X | + | 405 2 |
97 100 | X | + | 405 2 | = | 19000 |
97 100 | X | = | 19000 | − | 405 2 |
97 100 | X | = | 37595 2 |
| X | = | 37595 2 | ÷ | 97 100 |
| = | 37595 2 | × | 100 97 |
| = | 37595 | × | 50 97 |
| X | = | 1879750 97 |
| X | = | 19378.865979 |