| 1 | ÷ | 3 | × | ( | 100 | − | x | ) | + | 3 | = | 100 |
| 方程左边 = | 1 3 | ( | 100 | − | x | ) | + | 3 |
1 3 | ( | 100 | − | x | ) | + | 3 | = | 100 |
| 方程左边 = | 1 3 | × | 100 | − | 1 3 | x | + | 3 |
| = | 100 3 | − | 1 3 | x | + | 3 |
| = | 109 3 | − | 1 3 | x |
109 3 | − | 1 3 | x | = | 100 |
| - | 1 3 | x | = | 100 | − | 109 3 |
| - | 1 3 | x | = | 191 3 |
| - | 191 3 | = | 1 3 | x |
1 3 | x | = | - | 191 3 |
| x | = | - | 191 3 | ÷ | 1 3 |
| = | - | 191 3 | × | 3 |
| = | - | 191 | × | 1 |
| x | = | - | 191 |