| x | ÷ | 100 | + | x | ÷ | 280 | + | x | ÷ | 370 | − | 3 | ÷ | 10 | = | 3 |
| 方程左边 = | x | × | 1 100 | + | x | × | 1 280 | + | x | × | 1 370 | − | 3 10 |
| = | 843 51800 | x | − | 3 10 |
843 51800 | x | − | 3 10 | = | 3 |
843 51800 | x | = | 3 | + | 3 10 |
843 51800 | x | = | 33 10 |
| x | = | 33 10 | ÷ | 843 51800 |
| = | 33 10 | × | 51800 843 |
| = | 11 | × | 5180 281 |
| x | = | 56980 281 |
| x | = | 202.775801 |