| ( | 10 | x | + | ( | 8 | − | x | ) | ) | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) | = | 1855 |
| 方程左边 = | 10 | x | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) | + | ( | 8 | − | x | ) | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 10 | x | × | 10 | ( | 8 | − | x | ) | + | 10 | x | × | 10 | + | ( | 8 | − | x | ) | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 100 | x | ( | 8 | − | x | ) | + | 100 | x | + | ( | 8 | − | x | ) | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 100 | x | × | 8 | − | 100 | x | x | + | 100 | x | + | ( | 8 | − | x | ) | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 800 | x | − | 100 | x | x | + | 100 | x | + | ( | 8 | − | x | ) | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 900 | x | − | 100 | x | x | + | ( | 8 | − | x | ) | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 900 | x | − | 100 | x | x | + | 8 | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) | − | x | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 900 | x | − | 100 | x | x | + | 8 | × | 10 | ( | 8 | − | x | ) | + | 8 | × | 10 | − | x | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 900 | x | − | 100 | x | x | + | 80 | ( | 8 | − | x | ) | + | 80 | − | x | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 900 | x | − | 100 | x | x | + | 80 | × | 8 | − | 80 | x | + | 80 | − | x | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 900 | x | − | 100 | x | x | + | 640 | − | 80 | x | + | 80 | − | x | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 820 | x | − | 100 | x | x | + | 720 | − | x | ( | 10 | ( | 8 | − | x | ) | + | 10 | ) |
| = | 820 | x | − | 100 | x | x | + | 720 | − | x | × | 10 | ( | 8 | − | x | ) | − | x | × | 10 |
| = | 810 | x | − | 100 | x | x | + | 720 | − | x | × | 10 | ( | 8 | − | x | ) |
| = | 810 | x | − | 100 | x | x | + | 720 | − | x | × | 10 | × | 8 | + | x | × | 10 | x |
| = | 810 | x | − | 100 | x | x | + | 720 | − | x | × | 80 | + | x | × | 10 | x |
| = | 730 | x | − | 100 | x | x | + | 720 | + | x | × | 10 | x |
| 730 | x | − | 100 | x | x | + | 720 | + | x | × | 10 | x | = | 1855 |