| 56 | X | − | ( | 40 | X | + | 580 | ) | − | ( | 182 25 | X | − | 5 | X | ) | × | 3 25 | = | 120 |
| 方程左边 = | 56 | X | − | 40 | X | − | 580 | − | ( | 182 25 | X | − | 5 | X | ) | × | 3 25 |
| = | 16 | X | − | 580 | − | ( | 182 25 | X | − | 5 | X | ) | × | 3 25 |
| = | 16 | X | − | 580 | − | 182 25 | X | × | 3 25 | + | 5 | X | × | 3 25 |
| = | 16 | X | − | 580 | − | 546 625 | X | + | 3 5 | X |
| = | 9829 625 | X | − | 580 |
9829 625 | X | − | 580 | = | 120 |
9829 625 | X | = | 120 | + | 580 |
9829 625 | X | = | 700 |
| X | = | 700 | ÷ | 9829 625 |
| = | 700 | × | 625 9829 |
| X | = | 437500 9829 |
| X | = | 44.511141 |