| ( | x | − | 616 25 | ) | ÷ | x | × | 100 100 | = | 30 100 |
| 方程两边同时乘以: | x |
| ( | x | − | 616 25 | ) | × | 100 100 | = | 30 100 | x |
| x | × | 100 100 | − | 616 25 | × | 100 100 | = | 30 100 | x |
| x | × | 100 100 | − | 616 25 | = | 30 100 | x |
100 100 | x | − | 30 100 | x | = | 616 25 |
7 10 | x | = | 616 25 |
| x | = | 616 25 | ÷ | 7 10 |
| = | 616 25 | × | 10 7 |
| = | 88 5 | × | 2 |
| x | = | 176 5 |
| x | = | 35.2 |