| 8 | + | x | = | ( | 3 20 | + | 3 | x | ) | × | 3 20 |
| 方程右边 = | 3 20 | × | 3 20 | + | 3 | x | × | 3 20 |
| = | 9 400 | + | 9 20 | x |
| 8 | + | x | = | 9 400 | + | 9 20 | x |
| x | − | 9 20 | x | = | 9 400 | − | 8 |
11 20 | x | = | 9 400 | − | 8 |
11 20 | x | = | - | 3191 400 |
| x | = | - | 3191 400 | ÷ | 11 20 |
| = | - | 3191 400 | × | 20 11 |
| = | - | 3191 20 | × | 1 11 |
| x | = | - | 3191 220 |
| x | = | - 14.504545 |