| 4 | x | ÷ | 13993 10 | − | 2000 | x | ÷ | 13993 40 | − | ( | 77 | ÷ | 5 | ) | ( | 5 | ÷ | 2 | ) | = | 3 2 |
| 方程左边 = | 40 13993 | x | − | 80000 13993 | x | − | ( | 77 | ÷ | 5 | ) | ( | 5 | ÷ | 2 | ) |
| = | - | 79960 13993 | x | − | ( | 77 | ÷ | 5 | ) | ( | 5 | ÷ | 2 | ) |
| - | 79960 13993 | x | − | ( | 77 | ÷ | 5 | ) | ( | 5 | ÷ | 2 | ) | = | 3 2 |
| 方程左边 = | - | 79960 13993 | x | − | 77 | ÷ | 5 | × | ( | 5 | ÷ | 2 | ) |
| = | - | 79960 13993 | x | − | 77 5 | ( | 5 | ÷ | 2 | ) |
| = | - | 79960 13993 | x | − | 77 5 | × | 5 | ÷ | 2 |
| = | - | 79960 13993 | x | − | 77 2 |
| - | 79960 13993 | x | − | 77 2 | = | 3 2 |
| - | 79960 13993 | x | = | 3 2 | + | 77 2 |
| - | 79960 13993 | x | = | 40 |
| - | 40 | = | 79960 13993 | x |
79960 13993 | x | = | - | 40 |
| x | = | - | 40 | ÷ | 79960 13993 |
| = | - | 40 | × | 13993 79960 |
| = | - | 1 | × | 13993 1999 |
| x | = | - | 13993 1999 |
| x | = | - 7 |