| ( | x | − | 480 | ) | ÷ | 22000 | = | ( | x | − | 880 | ) | ÷ | 18000 |
| 方程左边 = | x | × | 1 22000 | − | 480 | × | 1 22000 |
| = | x | × | 1 22000 | − | 6 275 |
1 22000 | x | − | 6 275 | = | ( | x | − | 880 | ) | ÷ | 18000 |
| 方程右边 = | x | × | 1 18000 | − | 880 | × | 1 18000 |
| = | x | × | 1 18000 | − | 11 225 |
1 22000 | x | − | 6 275 | = | 1 18000 | x | − | 11 225 |
1 22000 | x | − | 1 18000 | x | = | - | 11 225 | + | 6 275 |
| - | 1 99000 | x | = | - | 11 225 | + | 6 275 |
| - | 1 99000 | x | = | - | 67 2475 |
67 2475 | = | 1 99000 | x |
1 99000 | x | = | 67 2475 |
| x | = | 67 2475 | ÷ | 1 99000 |
| = | 67 2475 | × | 99000 |
| = | 67 | × | 40 |
| x | = | 2680 |