| - | 11 | ÷ | ( | 9 | + | 2 | ( | 3 | x | + | 13 | ) | ) | − | 7 | = | 4 |
| 方程两边同时乘以: | ( | 9 | + | 2 | ( | 3 | x | + | 13 | ) | ) |
| - | 11 | − | 7 | ( | 9 | + | 2 | ( | 3 | x | + | 13 | ) | ) | = | 4 | ( | 9 | + | 2 | ( | 3 | x | + | 13 | ) | ) |
| - | 11 | − | 7 | × | 9 | − | 7 | × | 2 | ( | 3 | x | + | 13 | ) | = | 4 | ( | 9 | + | 2 | ( | 3 | x | + | 13 | ) | ) |
| - | 11 | − | 7 | × | 9 | − | 7 | × | 2 | ( | 3 | x | + | 13 | ) | = | 4 | × | 9 | + | 4 | × | 2 | ( | 3 | x | + | 13 | ) |
| - | 11 | − | 63 | − | 14 | ( | 3 | x | + | 13 | ) | = | 36 | + | 8 | ( | 3 | x | + | 13 | ) |
| - | 74 | − | 14 | ( | 3 | x | + | 13 | ) | = | 36 | + | 8 | ( | 3 | x | + | 13 | ) |
| - | 74 | − | 14 | × | 3 | x | − | 14 | × | 13 | = | 36 | + | 8 | ( | 3 | x | + | 13 | ) |
| - | 74 | − | 14 | × | 3 | x | − | 14 | × | 13 | = | 36 | + | 8 | × | 3 | x | + | 8 | × | 13 |
| - | 74 | − | 42 | x | − | 182 | = | 36 | + | 24 | x | + | 104 |
| - | 256 | − | 42 | x | = | 140 | + | 24 | x |
| - | 42 | x | − | 24 | x | = | 140 | + | 256 |
| - | 66 | x | = | 140 | + | 256 |
| - | 66 | x | = | 396 |
| - | 396 | = | 66 | x |
| 66 | x | = | - | 396 |
| x | = | - | 396 | ÷ | 66 |
| = | - | 396 | × | 1 66 |
| = | - | 6 | × | 1 |
| x | = | - | 6 |