| ( | 3 6250 | − | x | ) | ( | 1 500 | − | x | ) | = | 11 100000000000 |
| 方程左边 = | 3 6250 | ( | 1 500 | − | x | ) | − | x | ( | 1 500 | − | x | ) |
| = | 3 6250 | × | 1 500 | − | 3 6250 | x | − | x | ( | 1 500 | − | x | ) |
| = | 3 3125000 | − | 3 6250 | x | − | x | ( | 1 500 | − | x | ) |
| = | 3 3125000 | − | 3 6250 | x | − | x | × | 1 500 | + | x | x |
| = | 3 3125000 | − | 31 12500 | x | + | x | x |
3 3125000 | − | 31 12500 | x | + | x | x | = | 11 100000000000 |