| x | = | 1100 | × | 36 5 | + | 6969 5000 | x |
| 方程右边 = | 7920 | + | 6969 5000 | x |
| x | = | 7920 | + | 6969 5000 | x |
| x | − | 6969 5000 | x | = | 7920 |
| - | 1969 5000 | x | = | 7920 |
| - | 7920 | = | 1969 5000 | x |
1969 5000 | x | = | - | 7920 |
| x | = | - | 7920 | ÷ | 1969 5000 |
| = | - | 7920 | × | 5000 1969 |
| = | - | 720 | × | 5000 179 |
| x | = | - | 3600000 179 |
| x | = | - 20111.731844 |