| ( | 10 | − | 1 2 | x | ) | ( | 576 | + | 6 | x | ) | = | 4800 |
| 方程左边 = | 10 | ( | 576 | + | 6 | x | ) | − | 1 2 | x | ( | 576 | + | 6 | x | ) |
| = | 10 | × | 576 | + | 10 | × | 6 | x | − | 1 2 | x | ( | 576 | + | 6 | x | ) |
| = | 5760 | + | 60 | x | − | 1 2 | x | ( | 576 | + | 6 | x | ) |
| = | 5760 | + | 60 | x | − | 1 2 | x | × | 576 | − | 1 2 | x | × | 6 | x |
| = | 5760 | + | 60 | x | − | 288 | x | − | 3 | x | x |
| = | 5760 | − | 228 | x | − | 3 | x | x |
| 5760 | − | 228 | x | − | 3 | x | x | = | 4800 |