| ( | 1247 10 | − | x | ) | ( | 50 | + | 2 | x | ) | = | 0 |
| 方程左边 = | 1247 10 | ( | 50 | + | 2 | x | ) | − | x | ( | 50 | + | 2 | x | ) |
| = | 1247 10 | × | 50 | + | 1247 10 | × | 2 | x | − | x | ( | 50 | + | 2 | x | ) |
| = | 6235 | + | 1247 5 | x | − | x | ( | 50 | + | 2 | x | ) |
| = | 6235 | + | 1247 5 | x | − | x | × | 50 | − | x | × | 2 | x |
| = | 6235 | + | 997 5 | x | − | x | × | 2 | x |
| 6235 | + | 997 5 | x | − | x | × | 2 | x | = | 0 |
| x2= | 1247 10 |