| 6 | ÷ | ( | 6 | − | a | ) | = | ( | 7 | + | a | ) | ÷ | 6 |
| 方程两边同时乘以: | ( | 6 | − | a | ) |
| 6 | = | ( | 7 | + | a | ) | ÷ | 6 | × | ( | 6 | − | a | ) |
| 6 | = | 7 | ÷ | 6 | × | ( | 6 | − | a | ) | + | a | ÷ | 6 | × | ( | 6 | − | a | ) |
| 6 | = | 7 6 | ( | 6 | − | a | ) | + | a | × | 1 6 | ( | 6 | − | a | ) |
| 6 | = | 7 6 | × | 6 | − | 7 6 | a | + | a | × | 1 6 | ( | 6 | − | a | ) |
| 6 | = | 7 | − | 7 6 | a | + | a | × | 1 6 | ( | 6 | − | a | ) |
| 6 | = | 7 | − | 7 6 | a | + | a | × | 1 6 | × | 6 | − | a | × | 1 6 | a |
| 6 | = | 7 | − | 7 6 | a | + | a | × | 1 | − | a | × | 1 6 | a |
| 6 | = | 7 | − | 1 6 | a | − | a | × | 1 6 | a |