1 200 | = | ( | 1 | ÷ | 1 | + | 17 20 | x | ) |
| 方程右边 = | 1 | ÷ | 1 | + | 17 20 | x |
| = | 1 | + | 17 20 | x |
1 200 | = | 1 | + | 17 20 | x |
| - | 17 20 | x | = | 1 | − | 1 200 |
| - | 17 20 | x | = | 199 200 |
| - | 199 200 | = | 17 20 | x |
17 20 | x | = | - | 199 200 |
| x | = | - | 199 200 | ÷ | 17 20 |
| = | - | 199 200 | × | 20 17 |
| = | - | 199 10 | × | 1 17 |
| x | = | - | 199 170 |
| x | = | - 1.170588 |