| ( | ( | 15 | − | x | − | ( | 15 | − | x | ) | ÷ | 60 | × | 5 | ) | × | 60 | ÷ | 65 | × | 2 | + | x | ) | ÷ | 60 | = | x | ÷ | 5 |
| 方程左边 = | ( | 15 | − | x | − | ( | 15 | − | x | ) | ÷ | 60 | × | 5 | ) | × | 60 | ÷ | 65 | × | 2 | × | 1 60 | + | x | × | 1 60 |
| = | ( | 15 | − | x | − | ( | 15 | − | x | ) | ÷ | 60 | × | 5 | ) | × | 2 65 | + | x | × | 1 60 |
| = | 15 | × | 2 65 | − | x | × | 2 65 | − | ( | 15 | − | x | ) | ÷ | 60 | × | 5 | × | 2 65 | + | 1 60 | x |
| = | 6 13 | − | x | × | 2 65 | − | ( | 15 | − | x | ) | × | 1 390 | + | 1 60 | x |
| = | 6 13 | − | 11 780 | x | − | ( | 15 | − | x | ) | × | 1 390 |
| = | 6 13 | − | 11 780 | x | − | 15 | × | 1 390 | + | x | × | 1 390 |
| = | 6 13 | − | 11 780 | x | − | 1 26 | + | x | × | 1 390 |
| = | 11 26 | − | 3 260 | x |
11 26 | − | 3 260 | x | = | x | ÷ | 5 |
| - | 3 260 | x | − | 1 5 | x | = | - | 11 26 |
| - | 11 52 | x | = | - | 11 26 |
11 26 | = | 11 52 | x |
11 52 | x | = | 11 26 |
| x | = | 11 26 | ÷ | 11 52 |
| = | 11 26 | × | 52 11 |
| = | 1 | × | 2 |
| x | = | 2 |