| ( | 2 | ( | ( | 15 | − | x | − | ( | 15 | − | x | ) | ÷ | 60 | ) | + | x | ) | ÷ | 60 | ) | = | x | ÷ | 5 |
| 方程左边 = | 2 | ( | ( | 15 | − | x | − | ( | 15 | − | x | ) | ÷ | 60 | ) | + | x | ) | ÷ | 60 |
| = | 1 30 | ( | ( | 15 | − | x | − | ( | 15 | − | x | ) | ÷ | 60 | ) | + | x | ) |
| = | 1 30 | ( | 15 | − | x | − | ( | 15 | − | x | ) | ÷ | 60 | ) | + | 1 30 | x |
| = | 1 30 | × | 15 | − | 1 30 | x | − | 1 30 | ( | 15 | − | x | ) | ÷ | 60 | + | 1 30 | x |
| = | 1 2 | − | 1 30 | x | − | 1 1800 | ( | 15 | − | x | ) | + | 1 30 | x |
| = | 1 2 | − | 0 | x | − | 1 1800 | ( | 15 | − | x | ) |
| = | 1 2 | − | 1 1800 | × | 15 | + | 1 1800 | x |
| = | 1 2 | − | 1 120 | + | 1 1800 | x |
| = | 59 120 | + | 1 1800 | x |
59 120 | + | 1 1800 | x | = | x | ÷ | 5 |
1 1800 | x | − | 1 5 | x | = | - | 59 120 |
| - | 359 1800 | x | = | - | 59 120 |
59 120 | = | 359 1800 | x |
359 1800 | x | = | 59 120 |
| x | = | 59 120 | ÷ | 359 1800 |
| = | 59 120 | × | 1800 359 |
| = | 59 | × | 15 359 |
| x | = | 885 359 |
| x | = | 2.465181 |