| x | − | 1 5 | x | − | 1 20 | x | − | 3 | = | 372 25 | + | 1 5 | × | 372 25 |
| 方程左边 = | 3 4 | x | − | 3 |
3 4 | x | − | 3 | = | 372 25 | + | 1 5 | × | 372 25 |
| 方程右边 = | 372 25 | + | 372 125 |
| = | 2232 125 |
3 4 | x | − | 3 | = | 2232 125 |
3 4 | x | = | 2232 125 | + | 3 |
3 4 | x | = | 2607 125 |
| x | = | 2607 125 | ÷ | 3 4 |
| = | 2607 125 | × | 4 3 |
| = | 869 125 | × | 4 |
| x | = | 3476 125 |
| x | = | 27.808 |