| ( | 139 50 | x | ) | ÷ | ( | 1400 | + | x | ) | = | 667 1000 |
| 方程两边同时乘以: | ( | 1400 | + | x | ) |
| ( | 139 50 | x | ) | = | 667 1000 | ( | 1400 | + | x | ) |
139 50 | x | = | 667 1000 | ( | 1400 | + | x | ) |
139 50 | x | = | 667 1000 | × | 1400 | + | 667 1000 | x |
139 50 | x | = | 4669 5 | + | 667 1000 | x |
139 50 | x | − | 667 1000 | x | = | 4669 5 |
2113 1000 | x | = | 4669 5 |
| x | = | 4669 5 | ÷ | 2113 1000 |
| = | 4669 5 | × | 1000 2113 |
| = | 4669 | × | 200 2113 |
| x | = | 933800 2113 |
| x | = | 441.930904 |