| ( | 429403 10 | − | x | ) | ÷ | x | × | 100 100 | = | 31 1000 |
| 方程两边同时乘以: | x |
| ( | 429403 10 | − | x | ) | × | 100 100 | = | 31 1000 | x |
429403 10 | × | 100 100 | − | x | × | 100 100 | = | 31 1000 | x |
429403 10 | − | x | × | 100 100 | = | 31 1000 | x |
| - | 100 100 | x | − | 31 1000 | x | = | - | 429403 10 |
| - | 1031 1000 | x | = | - | 429403 10 |
429403 10 | = | 1031 1000 | x |
1031 1000 | x | = | 429403 10 |
| x | = | 429403 10 | ÷ | 1031 1000 |
| = | 429403 10 | × | 1000 1031 |
| = | 429403 | × | 100 1031 |
| x | = | 42940300 1031 |
| x | = | 41649.175558 |