| ( | 2 | ( | x | − | x | ÷ | 60 | ) | + | 15 | − | x | ) | ÷ | 60 | = | ( | 15 | − | x | ) | ÷ | 5 |
| 方程左边 = | 2 | ( | x | − | x | ÷ | 60 | ) | × | 1 60 | + | 15 | × | 1 60 | − | x | × | 1 60 |
| = | 1 30 | ( | x | − | x | ÷ | 60 | ) | + | 1 4 | − | x | × | 1 60 |
| = | 1 30 | x | − | 1 30 | x | ÷ | 60 | + | 1 4 | − | 1 60 | x |
| = | 1 30 | x | − | 1 1800 | x | + | 1 4 | − | 1 60 | x |
| = | 29 1800 | x | + | 1 4 |
29 1800 | x | + | 1 4 | = | ( | 15 | − | x | ) | ÷ | 5 |
| 方程右边 = | 15 | × | 1 5 | − | x | × | 1 5 |
| = | 3 | − | x | × | 1 5 |
29 1800 | x | + | 1 4 | = | 3 | − | 1 5 | x |
29 1800 | x | + | 1 5 | x | = | 3 | − | 1 4 |
389 1800 | x | = | 3 | − | 1 4 |
389 1800 | x | = | 11 4 |
| x | = | 11 4 | ÷ | 389 1800 |
| = | 11 4 | × | 1800 389 |
| = | 11 | × | 450 389 |
| x | = | 4950 389 |
| x | = | 12.724936 |