| ( | ( | X | × | 11 2000 | ) | + | 3 | ) | + | X | = | 15000 |
| 方程左边 = | ( | X | × | 11 2000 | ) | + | 3 | + | X |
| = | X | × | 11 2000 | + | 3 | + | X |
| = | 2011 2000 | X | + | 3 |
2011 2000 | X | + | 3 | = | 15000 |
2011 2000 | X | = | 15000 | − | 3 |
2011 2000 | X | = | 14997 |
| X | = | 14997 | ÷ | 2011 2000 |
| = | 14997 | × | 2000 2011 |
| X | = | 29994000 2011 |
| X | = | 14914.967678 |