| ( | 62 5 | − | x | ) | ÷ | ( | 154 5 | − | x | ) | × | 40 | + | 60 | = | 72 |
| 方程两边同时乘以: | ( | 154 5 | − | x | ) |
| ( | 62 5 | − | x | ) | × | 40 | + | 60 | ( | 154 5 | − | x | ) | = | 72 | ( | 154 5 | − | x | ) |
62 5 | × | 40 | − | x | × | 40 | + | 60 | ( | 154 5 | − | x | ) | = | 72 | ( | 154 5 | − | x | ) |
62 5 | × | 40 | − | x | × | 40 | + | 60 | ( | 154 5 | − | x | ) | = | 72 | × | 154 5 | − | 72 | x |
| 496 | − | x | × | 40 | + | 60 | ( | 154 5 | − | x | ) | = | 11088 5 | − | 72 | x |
| 496 | − | 40 | x | + | 60 | × | 154 5 | − | 60 | x | = | 11088 5 | − | 72 | x |
| 496 | − | 40 | x | + | 1848 | − | 60 | x | = | 11088 5 | − | 72 | x |
| 2344 | − | 100 | x | = | 11088 5 | − | 72 | x |
| - | 100 | x | + | 72 | x | = | 11088 5 | − | 2344 |
| - | 28 | x | = | 11088 5 | − | 2344 |
| - | 28 | x | = | - | 632 5 |
632 5 | = | 28 | x |
| 28 | x | = | 632 5 |
| x | = | 632 5 | ÷ | 28 |
| = | 632 5 | × | 1 28 |
| = | 158 5 | × | 1 7 |
| x | = | 158 35 |
| x | = | 4.514286 |