| 5 | k | ÷ | ( | k | + | 2 | ) | + | ( | 8 | ÷ | k | ) | = | 5 |
| 方程两边同时乘以: | ( | k | + | 2 | ) |
| 5 | k | + | ( | 8 | ÷ | k | ) | ( | k | + | 2 | ) | = | 5 | ( | k | + | 2 | ) |
| 5 | k | + | 8 | ÷ | k | × | ( | k | + | 2 | ) | = | 5 | ( | k | + | 2 | ) |
| 5 | k | + | 8 | ÷ | k | × | ( | k | + | 2 | ) | = | 5 | k | + | 5 | × | 2 |
| 5 | k | + | 8 | ÷ | k | × | ( | k | + | 2 | ) | = | 5 | k | + | 10 |
| 方程两边同时乘以: | k |
| 5 | k | k | + | 8 | ( | k | + | 2 | ) | = | 5 | k | k | + | 10 | k |
| 5 | k | k | + | 8 | k | + | 8 | × | 2 | = | 5 | k | k | + | 10 | k |
| 5 | k | k | + | 8 | k | + | 16 | = | 5 | k | k | + | 10 | k |