| 1200 | ÷ | x | = | 1452 | ÷ | ( | 110 100 | x | ) | − | 20 |
| 方程两边同时乘以: | x | , | ( | 110 100 | × | 1 | ) |
| 1200 | ( | 110 100 | × | 1 | ) | = | 1452 | × | 1 | − | 20 | x | ( | 110 100 | × | 1 | ) |
| 1200 | × | 110 100 | × | 1 | = | 1452 | × | 1 | − | 20 | x | ( | 110 100 | × | 1 | ) |
| 1200 | × | 110 100 | × | 1 | = | 1452 | × | 1 | − | 20 | x | × | 110 100 | × | 1 |
| 1320 | = | 1452 | − | 22 | x |
| 22 | x | = | 1452 | − | 1320 |
| 22 | x | = | 132 |
| x | = | 132 | ÷ | 22 |
| = | 132 | × | 1 22 |
| = | 6 | × | 1 |
| x | = | 6 |