| ( | 50 | − | x | ) | ÷ | ( | x | − | 49 | ) | = | 2 | ÷ | 3 |
| 方程两边同时乘以: | ( | x | − | 49 | ) |
| ( | 50 | − | x | ) | = | 2 | ÷ | 3 | × | ( | x | − | 49 | ) |
| 50 | − | x | = | 2 | ÷ | 3 | × | ( | x | − | 49 | ) |
| 50 | − | x | = | 2 | ÷ | 3 | × | x | − | 2 | ÷ | 3 | × | 49 |
| 50 | − | x | = | 2 3 | x | − | 98 3 |
| - | x | − | 2 3 | x | = | - | 98 3 | − | 50 |
| - | 5 3 | x | = | - | 98 3 | − | 50 |
| - | 5 3 | x | = | - | 248 3 |
248 3 | = | 5 3 | x |
5 3 | x | = | 248 3 |
| x | = | 248 3 | ÷ | 5 3 |
| = | 248 3 | × | 3 5 |
| = | 248 | × | 1 5 |
| x | = | 248 5 |
| x | = | 49.6 |