| X | − | X | × | 3 50 | − | X | × | 1 20 | − | X | × | 3 20 | − | X | × | 3 20 | × | 1 4 | − | 32000 | = | 0 |
| 方程左边 = | X | − | X | × | 3 50 | − | X | × | 1 20 | − | X | × | 3 20 | − | X | × | 3 80 | − | 32000 |
| = | 281 400 | X | − | 32000 |
281 400 | X | − | 32000 | = | 0 |
281 400 | X | = | 0 | + | 32000 |
281 400 | X | = | 32000 |
| X | = | 32000 | ÷ | 281 400 |
| = | 32000 | × | 400 281 |
| X | = | 12800000 281 |
| X | = | 45551.601423 |