| 24 | k | − | ( | 560 | − | 4 | k | ) | = | 24 | ( | 560 | − | 4 | k | ) | ÷ | 4 |
| 方程左边 = | 24 | k | − | 560 | + | 4 | k |
| = | 28 | k | − | 560 |
| 28 | k | − | 560 | = | 24 | ( | 560 | − | 4 | k | ) | ÷ | 4 |
| 方程右边 = | 6 | ( | 560 | − | 4 | k | ) |
| 28 | k | − | 560 | = | 6 | ( | 560 | − | 4 | k | ) |
| 方程右边 = | 6 | × | 560 | − | 6 | × | 4 | k |
| = | 3360 | − | 24 | k |
| 28 | k | − | 560 | = | 3360 | − | 24 | k |
| 28 | k | + | 24 | k | = | 3360 | + | 560 |
| 52 | k | = | 3360 | + | 560 |
| 52 | k | = | 3920 |
| k | = | 3920 | ÷ | 52 |
| = | 3920 | × | 1 52 |
| = | 980 | × | 1 13 |
| k | = | 980 13 |
| k | = | 75.384615 |