| ( | 1620 | X | × | 150 | ) | × | 17 20 | − | 124000 | − | 1620 | × | 20 | X | = | 0 |
| 方程左边 = | ( | 1620 | X | × | 150 | ) | × | 17 20 | − | 124000 | − | 32400 | X |
| ( | 1620 | X | × | 150 | ) | × | 17 20 | − | 124000 | − | 32400 | X | = | 0 |
| 方程左边 = | 1620 | X | × | 150 | × | 17 20 | − | 124000 | − | 32400 | X |
| = | 206550 | X | − | 124000 | − | 32400 | X |
| = | 174150 | X | − | 124000 |
| 174150 | X | − | 124000 | = | 0 |
| 174150 | X | = | 0 | + | 124000 |
| 174150 | X | = | 124000 |
| X | = | 124000 | ÷ | 174150 |
| = | 124000 | × | 1 174150 |
| = | 2480 | × | 1 3483 |
| X | = | 2480 3483 |
| X | = | 0.71203 |