| ( | 119 | − | x | ) | ÷ | ( | 193 | − | x | ) | = | 2 5 |
| 方程两边同时乘以: | ( | 193 | − | x | ) |
| ( | 119 | − | x | ) | = | 2 5 | ( | 193 | − | x | ) |
| 119 | − | x | = | 2 5 | ( | 193 | − | x | ) |
| 119 | − | x | = | 2 5 | × | 193 | − | 2 5 | x |
| 119 | − | x | = | 386 5 | − | 2 5 | x |
| - | x | + | 2 5 | x | = | 386 5 | − | 119 |
| - | 3 5 | x | = | 386 5 | − | 119 |
| - | 3 5 | x | = | - | 209 5 |
209 5 | = | 3 5 | x |
3 5 | x | = | 209 5 |
| x | = | 209 5 | ÷ | 3 5 |
| = | 209 5 | × | 5 3 |
| = | 209 | × | 1 3 |
| x | = | 209 3 |
| x | = | 69.666667 |