| ( | 10 | x | + | 5 | − | x | ) | ( | 50 | − | 10 | x | + | x | ) | = | 736 |
| 方程左边 = | 10 | x | ( | 50 | − | 10 | x | + | x | ) | + | 5 | ( | 50 | − | 10 | x | + | x | ) | − | x | ( | 50 | − | 10 | x | + | x | ) |
| = | 10 | x | × | 50 | − | 10 | x | × | 10 | x | + | 10 | x | x | + | 5 | ( | 50 | − | 10 | x | + | x | ) |
| = | 500 | x | − | 100 | x | x | + | 10 | x | x | + | 5 | ( | 50 | − | 10 | x | + | x | ) | − | x | ( | 50 | − | 10 | x | + | x | ) |
| = | 500 | x | − | 100 | x | x | + | 10 | x | x | + | 5 | × | 50 | − | 5 | × | 10 |
| = | 500 | x | − | 100 | x | x | + | 10 | x | x | + | 250 | − | 50 | x | + | 5 |
| = | 455 | x | − | 100 | x | x | + | 10 | x | x | + | 250 | − | x | ( | 50 | − | 10 | x | + | x | ) |
| = | 455 | x | − | 100 | x | x | + | 10 | x | x | + | 250 | − | x | × | 50 | + | x |
| = | 405 | x | − | 100 | x | x | + | 10 | x | x | + | 250 | + | x | × | 10 | x |
| 405 | x | − | 100 | x | x | + | 10 | x | x | + | 250 | + | x | × | 10 | x | = | 736 |