| ( | X | − | 809 100 | ) | ÷ | 809 100 | × | 100 100 | = | 0 |
| Left side of the equation = | ( | X | − | 809 100 | ) | × | 100 809 |
| ( | X | − | 809 100 | ) | × | 100 809 | = | 0 |
| Left side of the equation = | X | × | 100 809 | − | 809 100 | × | 100 809 |
| = | X | × | 100 809 | − | 1 |
100 809 | X | − | 1 | = | 0 |
100 809 | X | = | 0 | + | 1 |
100 809 | X | = | 1 |
| X | = | 1 | ÷ | 100 809 |
| = | 1 | × | 809 100 |
| X | = | 809 100 |
| X | = | 8.09 |