| ( | 100 | − | x | + | 9 2 | ) | × | 31699 10000 | − | 90 | = | 0 |
| 方程左边 = | 100 | × | 31699 10000 | − | x | × | 31699 10000 | + | 9 2 | × | 31699 10000 | − | 90 |
| = | 31699 100 | − | x | × | 31699 10000 | + | 285291 20000 | − | 90 |
| = | 4825091 20000 | − | 31699 10000 | x |
4825091 20000 | − | 31699 10000 | x | = | 0 |
| - | 31699 10000 | x | = | 0 | − | 4825091 20000 |
| - | 31699 10000 | x | = | - | 4825091 20000 |
4825091 20000 | = | 31699 10000 | x |
31699 10000 | x | = | 4825091 20000 |
| x | = | 4825091 20000 | ÷ | 31699 10000 |
| = | 4825091 20000 | × | 10000 31699 |
| = | 4825091 2 | × | 1 31699 |
| x | = | 4825091 63398 |
| x | = | 76.107937 |