| 5 | ÷ | 12 | + | 4 | = | ( | x | + | 4 | ) | × | 6 | ÷ | 13 |
| 方程左边 = | 5 12 | + | 4 |
| = | 53 12 |
53 12 | = | ( | x | + | 4 | ) | × | 6 | ÷ | 13 |
| 方程右边 = | ( | x | + | 4 | ) | × | 6 13 |
53 12 | = | ( | x | + | 4 | ) | × | 6 13 |
| 方程右边 = | x | × | 6 13 | + | 4 | × | 6 13 |
| = | x | × | 6 13 | + | 24 13 |
53 12 | = | 6 13 | x | + | 24 13 |
| - | 6 13 | x | = | 24 13 | − | 53 12 |
| - | 6 13 | x | = | - | 401 156 |
401 156 | = | 6 13 | x |
6 13 | x | = | 401 156 |
| x | = | 401 156 | ÷ | 6 13 |
| = | 401 156 | × | 13 6 |
| = | 401 12 | × | 1 6 |
| x | = | 401 72 |
| x | = | 5.569444 |