1 5 | ( | 1 | + | X | ) | ÷ | ( | 12 100 | − | X | ) | = | 3 |
| 方程两边同时乘以: | ( | 12 100 | − | X | ) |
1 5 | ( | 1 | + | X | ) | = | 3 | ( | 12 100 | − | X | ) |
1 5 | × | 1 | + | 1 5 | X | = | 3 | ( | 12 100 | − | X | ) |
1 5 | × | 1 | + | 1 5 | X | = | 3 | × | 12 100 | − | 3 | X |
1 5 | + | 1 5 | X | = | 9 25 | − | 3 | X |
1 5 | X | + | 3 | X | = | 9 25 | − | 1 5 |
16 5 | X | = | 9 25 | − | 1 5 |
16 5 | X | = | 4 25 |
| X | = | 4 25 | ÷ | 16 5 |
| = | 4 25 | × | 5 16 |
| = | 1 5 | × | 1 4 |
| X | = | 1 20 |
| X | = | 0.05 |