| 1200 | ÷ | x | = | 1452 | ÷ | 110 100 | − | 20 |
| 方程两边同时乘以: | x |
| 1200 | = | 1452 | ÷ | 110 100 | × | x | − | 20 | x |
| - | 1452 | ÷ | 110 100 | × | x | + | 20 | x | = | - | 1200 |
| - | 1320 | x | + | 20 | x | = | - | 1200 |
| - | 1300 | x | = | - | 1200 |
| 1200 | = | 1300 | x |
| 1300 | x | = | 1200 |
| x | = | 1200 | ÷ | 1300 |
| = | 1200 | × | 1 1300 |
| = | 12 | × | 1 13 |
| x | = | 12 13 |
| x | = | 0.923077 |