| ( | 105 | ( | 1 | + | 20 100 | ) | ) | + | ( | 8 100 | x | ) | = | x |
| Left side of the equation = | 105 | ( | 1 | + | 20 100 | ) | + | ( | 8 100 | x | ) |
| = | 105 | × | 1 | + | 105 | × | 20 100 | + | ( | 8 100 | x | ) |
| = | 105 | + | 21 | + | ( | 8 100 | x | ) |
| = | 126 | + | ( | 8 100 | x | ) |
| = | 126 | + | 8 100 | x |
| 126 | + | 8 100 | x | = | x |
8 100 | x | − | x | = | - | 126 |
| - | 23 25 | x | = | - | 126 |
| 126 | = | 23 25 | x |
23 25 | x | = | 126 |
| x | = | 126 | ÷ | 23 25 |
| = | 126 | × | 25 23 |
| x | = | 3150 23 |
| x | = | 136.956522 |