| ( | x | + | 293 | ) | × | 7 20 | = | 12000 | × | 13 20 |
| 方程左边 = | x | × | 7 20 | + | 293 | × | 7 20 |
| = | x | × | 7 20 | + | 2051 20 |
7 20 | x | + | 2051 20 | = | 12000 | × | 13 20 |
| 方程右边 = | 7800 |
7 20 | x | + | 2051 20 | = | 7800 |
7 20 | x | = | 7800 | − | 2051 20 |
7 20 | x | = | 153949 20 |
| x | = | 153949 20 | ÷ | 7 20 |
| = | 153949 20 | × | 20 7 |
| = | 153949 | × | 1 7 |
| x | = | 153949 7 |
| x | = | 21992.714286 |