| ( | X | × | 600 | ) | ÷ | ( | ( | 1 | − | X | ) | × | 1800 | ) | = | 3 10 |
| 方程两边同时乘以: | ( | ( | 1 | − | X | ) | × | 1800 | ) |
| ( | X | × | 600 | ) | = | 3 10 | ( | ( | 1 | − | X | ) | × | 1800 | ) |
| X | × | 600 | = | 3 10 | ( | ( | 1 | − | X | ) | × | 1800 | ) |
| X | × | 600 | = | 3 10 | ( | 1 | − | X | ) | × | 1800 |
| X | × | 600 | = | 540 | ( | 1 | − | X | ) |
| 600 | X | = | 540 | × | 1 | − | 540 | X |
| 600 | X | = | 540 | − | 540 | X |
| 600 | X | + | 540 | X | = | 540 |
| 1140 | X | = | 540 |
| X | = | 540 | ÷ | 1140 |
| = | 540 | × | 1 1140 |
| = | 9 | × | 1 19 |
| X | = | 9 19 |
| X | = | 0.473684 |