| ( | 1620 | X | × | 130 | ) | × | 17 20 | − | 124000 | − | 1620 | × | 20 | X | = | 0 |
| 方程左边 = | ( | 1620 | X | × | 130 | ) | × | 17 20 | − | 124000 | − | 32400 | X |
| ( | 1620 | X | × | 130 | ) | × | 17 20 | − | 124000 | − | 32400 | X | = | 0 |
| 方程左边 = | 1620 | X | × | 130 | × | 17 20 | − | 124000 | − | 32400 | X |
| = | 179010 | X | − | 124000 | − | 32400 | X |
| = | 146610 | X | − | 124000 |
| 146610 | X | − | 124000 | = | 0 |
| 146610 | X | = | 0 | + | 124000 |
| 146610 | X | = | 124000 |
| X | = | 124000 | ÷ | 146610 |
| = | 124000 | × | 1 146610 |
| = | 12400 | × | 1 14661 |
| X | = | 12400 14661 |
| X | = | 0.845781 |