| ( | 6000000 | − | 4 | x | ) | ÷ | x | ÷ | 90 | = | 1 |
| 方程两边同时乘以: | x |
| ( | 6000000 | − | 4 | x | ) | ÷ | 90 | = | 1 | x |
| 6000000 | ÷ | 90 | − | 4 | x | ÷ | 90 | = | 1 | x |
200000 3 | − | 2 45 | x | = | 1 | x |
| - | 2 45 | x | − | 1 | x | = | - | 200000 3 |
| - | 47 45 | x | = | - | 200000 3 |
200000 3 | = | 47 45 | x |
47 45 | x | = | 200000 3 |
| x | = | 200000 3 | ÷ | 47 45 |
| = | 200000 3 | × | 45 47 |
| = | 200000 | × | 15 47 |
| x | = | 3000000 47 |
| x | = | 63829.787234 |