| x | = | 299792458 | × | 299792458 | ( | 83027 50000 | ) | ÷ | ( | 80109 50000 | ) |
| 方程两边同时乘以: | ( | 80109 50000 | ) |
| x | ( | 80109 50000 | ) | = | 299792458 | × | 299792458 | ( | 83027 50000 | ) |
| x | × | 80109 50000 | = | 299792458 | × | 299792458 | ( | 83027 50000 | ) |
| x | × | 80109 50000 | = | 299792458 | × | 299792458 | × | 83027 50000 |