| ( | X | − | 100 | ) | − | ( | X | − | 200 | − | ( | 100 | + | ( | X | − | 100 | ) | × | 1 | ÷ | 10 | ) | ) | = | 10000 |
| Left side of the equation = | X | − | 100 | − | ( | X | − | 200 | − | ( | 100 | + | ( | X | − | 100 | ) | × | 1 | ÷ | 10 | ) | ) |
| = | X | − | 100 | − | X | + | 200 | + | ( | 100 | + | ( | X | − | 100 | ) | × | 1 | ÷ | 10 | ) |
| = | 0 | X | + | 100 | + | ( | 100 | + | ( | X | − | 100 | ) | × | 1 | ÷ | 10 | ) |
| = | 0 | X | + | 100 | + | 100 | + | ( | X | − | 100 | ) | × | 1 | ÷ | 10 |
| = | 0 | X | + | 100 | + | 100 | + | ( | X | − | 100 | ) | × | 1 10 |
| = | 0 | X | + | 200 | + | ( | X | − | 100 | ) | × | 1 10 |
| = | 0 | X | + | 200 | + | X | × | 1 10 | − | 100 | × | 1 10 |
| = | 0 | X | + | 200 | + | X | × | 1 10 | − | 10 |
| = | 1 10 | X | + | 190 |
1 10 | X | + | 190 | = | 10000 |
1 10 | X | = | 10000 | − | 190 |
1 10 | X | = | 9810 |
| X | = | 9810 | ÷ | 1 10 |
| = | 9810 | × | 10 |
| X | = | 98100 |