252 5 | X | − | ( | 40 | X | + | 580 | ) | − | ( | 131 20 | X | − | 5 | X | ) | × | 3 25 | = | 60 |
| 方程左边 = | 252 5 | X | − | 40 | X | − | 580 | − | ( | 131 20 | X | − | 5 | X | ) | × | 3 25 |
| = | 52 5 | X | − | 580 | − | ( | 131 20 | X | − | 5 | X | ) | × | 3 25 |
| = | 52 5 | X | − | 580 | − | 131 20 | X | × | 3 25 | + | 5 | X | × | 3 25 |
| = | 52 5 | X | − | 580 | − | 393 500 | X | + | 3 5 | X |
| = | 5107 500 | X | − | 580 |
5107 500 | X | − | 580 | = | 60 |
5107 500 | X | = | 60 | + | 580 |
5107 500 | X | = | 640 |
| X | = | 640 | ÷ | 5107 500 |
| = | 640 | × | 500 5107 |
| X | = | 320000 5107 |
| X | = | 62.659095 |