| ( | 500 | + | 500 | ) | ÷ | ( | 20909 50 | + | X | ) | = | 1531 1250 |
| Multiply both sides of the equation by: | ( | 20909 50 | + | X | ) |
| ( | 500 | + | 500 | ) | = | 1531 1250 | ( | 20909 50 | + | X | ) |
| 500 | + | 500 | = | 1531 1250 | ( | 20909 50 | + | X | ) |
| 500 | + | 500 | = | 1531 1250 | × | 20909 50 | + | 1531 1250 | X |
| 500 | + | 500 | = | 32011679 62500 | + | 1531 1250 | X |
| 1000 | = | 32011679 62500 | + | 1531 1250 | X |
| - | 1531 1250 | X | = | 32011679 62500 | − | 1000 |
| - | 1531 1250 | X | = | - | 30488321 62500 |
30488321 62500 | = | 1531 1250 | X |
1531 1250 | X | = | 30488321 62500 |
| X | = | 30488321 62500 | ÷ | 1531 1250 |
| = | 30488321 62500 | × | 1250 1531 |
| = | 30488321 50 | × | 1 1531 |
| X | = | 30488321 76550 |
| X | = | 398.27983 |