| 158 | − | x | − | 2 | − | ( | 158 | − | x | − | 2 | ) | × | 9 50 | = | 68 |
| 方程左边 = | 156 | − | x | − | ( | 158 | − | x | − | 2 | ) | × | 9 50 |
| 156 | − | x | − | ( | 158 | − | x | − | 2 | ) | × | 9 50 | = | 68 |
| 方程左边 = | 156 | − | x | − | 158 | × | 9 50 | + | x | × | 9 50 | + | 2 | × | 9 50 |
| = | 156 | − | x | − | 711 25 | + | x | × | 9 50 | + | 9 25 |
| = | 3198 25 | − | 41 50 | x |
3198 25 | − | 41 50 | x | = | 68 |
| - | 41 50 | x | = | 68 | − | 3198 25 |
| - | 41 50 | x | = | - | 1498 25 |
1498 25 | = | 41 50 | x |
41 50 | x | = | 1498 25 |
| x | = | 1498 25 | ÷ | 41 50 |
| = | 1498 25 | × | 50 41 |
| = | 1498 | × | 2 41 |
| x | = | 2996 41 |
| x | = | 73.073171 |