| ( | 1900 | + | 7991 10 | x | ) | × | 2 | ( | 1900 | × | 11 10 | x | − | 800 | ) | × | 2 | = | 0 |
| 方程左边 = | ( | 1900 | + | 7991 10 | x | ) | × | 4 | ( | 1900 | × | 11 10 | x | − | 800 | ) |
| ( | 1900 | + | 7991 10 | x | ) | × | 4 | ( | 1900 | × | 11 10 | x | − | 800 | ) | = | 0 |
| 方程左边 = | 1900 | × | 4 | ( | 1900 | × | 11 10 | x | − | 800 | ) | + | 7991 10 | x | × | 4 | ( | 1900 | × | 11 10 | x | − | 800 | ) |
| = | 7600 | ( | 1900 | × | 11 10 | x | − | 800 | ) | + | 15982 5 | x | ( | 1900 | × | 11 10 | x | − | 800 | ) |
| = | 7600 | × | 1900 | × | 11 10 | x | − | 7600 | × | 800 | + | 15982 5 | x | ( | 1900 | × | 11 10 | x | − | 800 | ) |
| = | 15884000 | x | − | 6080000 | + | 15982 5 | x | ( | 1900 | × | 11 10 | x | − | 800 | ) |
| = | 15884000 | x | − | 6080000 | + | 15982 5 | x | × | 1900 | × | 11 10 | x | − | 15982 5 | x | × | 800 |
| = | 15884000 | x | − | 6080000 | + | 6680476 | x | x | − | 2557120 | x |
| = | 13326880 | x | − | 6080000 | + | 6680476 | x | x |
| 13326880 | x | − | 6080000 | + | 6680476 | x | x | = | 0 |