| ( | x | + | 10 100 | ) | ( | 1 | + | 17 100 | ) | − | x | ( | 1 | + | 20 100 | ) | = | 27 5 |
| 方程左边 = | x | ( | 1 | + | 17 100 | ) | + | 10 100 | ( | 1 | + | 17 100 | ) | − | x | ( | 1 | + | 20 100 | ) |
| = | x | × | 1 | + | x | × | 17 100 | + | 10 100 | ( | 1 | + | 17 100 | ) | − | x | ( | 1 | + | 20 100 | ) |
| = | 117 100 | x | + | 10 100 | ( | 1 | + | 17 100 | ) | − | x | ( | 1 | + | 20 100 | ) |
| = | 117 100 | x | + | 10 100 | × | 1 | + | 10 100 | × | 17 100 | − | x | ( | 1 | + | 20 100 | ) |
| = | 117 100 | x | + | 1 10 | + | 17 1000 | − | x | ( | 1 | + | 20 100 | ) |
| = | 117 100 | x | + | 117 1000 | − | x | ( | 1 | + | 20 100 | ) |
| = | 117 100 | x | + | 117 1000 | − | x | × | 1 | − | x | × | 20 100 |
| = | - | 3 100 | x | + | 117 1000 |
| - | 3 100 | x | + | 117 1000 | = | 27 5 |
| - | 3 100 | x | = | 27 5 | − | 117 1000 |
| - | 3 100 | x | = | 5283 1000 |
| - | 5283 1000 | = | 3 100 | x |
3 100 | x | = | - | 5283 1000 |
| x | = | - | 5283 1000 | ÷ | 3 100 |
| = | - | 5283 1000 | × | 100 3 |
| = | - | 1761 10 | × | 1 |
| x | = | - | 1761 10 |
| x | = | - 176.1 |