| 200000 | + | X | + | ( | 200000 | + | X | ) | × | 1 100 | = | 210000 |
| Left side of the equation = | 200000 | + | X | + | 200000 | × | 1 100 | + | X | × | 1 100 |
| = | 200000 | + | X | + | 2000 | + | X | × | 1 100 |
| = | 202000 | + | 101 100 | X |
| 202000 | + | 101 100 | X | = | 210000 |
101 100 | X | = | 210000 | − | 202000 |
101 100 | X | = | 8000 |
| X | = | 8000 | ÷ | 101 100 |
| = | 8000 | × | 100 101 |
| X | = | 800000 101 |
| X | = | 7920.792079 |