| X | × | 600 | ÷ | ( | ( | 1 | − | X | ) | × | 1800 | ) | = | 2 25 |
| 方程两边同时乘以: | ( | ( | 1 | − | X | ) | × | 1800 | ) |
| X | × | 600 | = | 2 25 | ( | ( | 1 | − | X | ) | × | 1800 | ) |
| X | × | 600 | = | 2 25 | ( | 1 | − | X | ) | × | 1800 |
| X | × | 600 | = | 144 | ( | 1 | − | X | ) |
| 600 | X | = | 144 | × | 1 | − | 144 | X |
| 600 | X | = | 144 | − | 144 | X |
| 600 | X | + | 144 | X | = | 144 |
| 744 | X | = | 144 |
| X | = | 144 | ÷ | 744 |
| = | 144 | × | 1 744 |
| = | 6 | × | 1 31 |
| X | = | 6 31 |
| X | = | 0.193548 |