| 320 | ÷ | 4000 | − | 50 | ÷ | 4000 | − | ( | ( | 1 | + | X | ) | ÷ | X | ) | × | 5 200 | × | 40 100 | = | 0 |
| 320 | ÷ | 4000 | − | 50 | ÷ | 4000 | − | ( | 1 | + | X | ) | ÷ | X | × | 5 200 | × | 40 100 | = | 0 |
2 25 | − | 1 80 | − | ( | 1 | + | X | ) | ÷ | X | × | 1 100 | = | 0 |
27 400 | − | ( | 1 | + | X | ) | ÷ | X | × | 1 100 | = | 0 |
| 方程两边同时乘以: | X |
27 400 | X | − | ( | 1 | + | X | ) | × | 1 100 | = | 0 |
27 400 | X | − | 1 | × | 1 100 | − | X | × | 1 100 | = | 0 |
27 400 | X | − | 1 100 | − | X | × | 1 100 | = | 0 |
23 400 | X | − | 1 100 | = | 0 |
23 400 | X | = | 0 | + | 1 100 |
23 400 | X | = | 1 100 |
| X | = | 1 100 | ÷ | 23 400 |
| = | 1 100 | × | 400 23 |
| = | 1 | × | 4 23 |
| X | = | 4 23 |
| X | = | 0.173913 |