| ( | ( | X | + | 20 | ) | ÷ | ( | 1 | − | 1 250 | ) | ) | × | 1 250 | = | 2000 |
| ( | X | + | 20 | ) | ÷ | ( | 1 | − | 1 250 | ) | × | 1 250 | = | 2000 |
| 方程两边同时乘以: | ( | 1 | − | 1 250 | ) |
| ( | X | + | 20 | ) | × | 1 250 | = | 2000 | ( | 1 | − | 1 250 | ) |
| X | × | 1 250 | + | 20 | × | 1 250 | = | 2000 | ( | 1 | − | 1 250 | ) |
| X | × | 1 250 | + | 20 | × | 1 250 | = | 2000 | × | 1 | − | 2000 | × | 1 250 |
| X | × | 1 250 | + | 2 25 | = | 2000 | − | 8 |
1 250 | X | + | 2 25 | = | 1992 |
1 250 | X | = | 1992 | − | 2 25 |
1 250 | X | = | 49798 25 |
| X | = | 49798 25 | ÷ | 1 250 |
| = | 49798 25 | × | 250 |
| = | 49798 | × | 10 |
| X | = | 497980 |