| 100000 | ÷ | x | × | 7 | ÷ | 6 | = | 140000 | ÷ | x | + | 30 |
| 方程两边同时乘以: | x |
| 100000 | × | 7 | ÷ | 6 | = | 140000 | ÷ | 1 | × | 1 | + | 30 | x |
| - | 30 | x | = | 140000 | ÷ | 1 | × | 1 | − | 100000 | × | 7 | ÷ | 6 |
| - | 30 | x | = | 140000 | − | 350000 3 |
| - | 30 | x | = | 70000 3 |
| - | 70000 3 | = | 30 | x |
| 30 | x | = | - | 70000 3 |
| x | = | - | 70000 3 | ÷ | 30 |
| = | - | 70000 3 | × | 1 30 |
| = | - | 7000 3 | × | 1 3 |
| x | = | - | 7000 9 |
| x | = | - 777.777778 |