| 10 | − | 2 | k | + | ( | 3 | ÷ | k | − | 1 | ) | ( | 10 | − | 2 | k | ) | = | 24 |
| 10 | − | 2 | k | + | 3 | ÷ | k | × | ( | 10 | − | 2 | k | ) | − | 1 | ( | 10 | − | 2 | k | ) | = | 24 |
| 方程两边同时乘以: | k |
| 10 | k | − | 2 | k | k | + | 3 | ( | 10 | − | 2 | k | ) | − | 1 | ( | 10 | − | 2 | k | ) | k | = | 24 | k |
| 10 | k | − | 2 | k | k | + | 3 | × | 10 | − | 3 | × | 2 | k | − | 1 | ( | 10 | − | 2 | k | ) | = | 24 | k |
| 10 | k | − | 2 | k | k | + | 30 | − | 6 | k | − | 1 | ( | 10 | − | 2 | k | ) | k | = | 24 | k |
| 4 | k | − | 2 | k | k | + | 30 | − | 1 | ( | 10 | − | 2 | k | ) | k | = | 24 | k |
| 4 | k | − | 2 | k | k | + | 30 | − | 1 | × | 10 | k | + | 1 | × | 2 | k | = | 24 | k |
| 4 | k | − | 2 | k | k | + | 30 | − | 10 | k | + | 2 | k | k | = | 24 | k |
| - | 6 | k | − | 2 | k | k | + | 30 | + | 2 | k | k | = | 24 | k |