| 114945 | = | x | + | x | × | 21 20 | + | x | × | 21 20 | × | 21 20 |
| 方程右边 = | x | + | x | × | 21 20 | + | x | × | 441 400 |
| = | 1261 400 | x |
| 114945 | = | 1261 400 | x |
| - | 1261 400 | x | = | - | 114945 |
| 114945 | = | 1261 400 | x |
1261 400 | x | = | 114945 |
| x | = | 114945 | ÷ | 1261 400 |
| = | 114945 | × | 400 1261 |
| x | = | 45978000 1261 |
| x | = | 36461.538462 |