| 64 | ÷ | ( | 2 | x | ) | + | 1800 | ÷ | ( | 5 | x | ) | = | 8 |
| 方程两边同时乘以: | ( | 2 | x | ) |
| 64 | + | 1800 | ÷ | ( | 5 | × | 1 | ) | × | ( | 2 | × | 1 | ) | = | 8 | ( | 2 | x | ) |
| 64 | + | 1800 | ÷ | ( | 5 | × | 1 | ) | × | 2 | × | 1 | = | 8 | ( | 2 | x | ) |
| 64 | + | 1800 | ÷ | ( | 5 | × | 1 | ) | × | 2 | × | 1 | = | 8 | × | 2 | x |
| 64 | + | 3600 | ÷ | ( | 5 | × | 1 | ) | = | 16 | x |
| 方程两边同时乘以: | ( | 5 | × | 1 | ) |
| 64 | ( | 5 | × | 1 | ) | + | 3600 | = | 16 | x | ( | 5 | × | 1 | ) |
| 64 | × | 5 | × | 1 | + | 3600 | = | 16 | x | ( | 5 | × | 1 | ) |
| 64 | × | 5 | × | 1 | + | 3600 | = | 16 | x | × | 5 | × | 1 |
| 320 | + | 3600 | = | 80 | x |
| 3920 | = | 80 | x |
| - | 80 | x | = | - | 3920 |
| 3920 | = | 80 | x |
| 80 | x | = | 3920 |
| x | = | 3920 | ÷ | 80 |
| = | 3920 | × | 1 80 |
| = | 49 | × | 1 |
| x | = | 49 |