| 100 | x | ÷ | ( | 100 | − | 321 50 | ) | = | 1009 50 |
| Multiply both sides of the equation by: | ( | 100 | − | 321 50 | ) |
| 100 | x | = | 1009 50 | ( | 100 | − | 321 50 | ) |
| 100 | x | = | 1009 50 | × | 100 | − | 1009 50 | × | 321 50 |
| 100 | x | = | 2018 | − | 323889 2500 |
| 100 | x | = | 4721111 2500 |
| x | = | 4721111 2500 | ÷ | 100 |
| = | 4721111 2500 | × | 1 100 |
| x | = | 4721111 250000 |
| x | = | 18.884444 |