| ( | 99 | ( | 1 | + | 20 100 | ) | ) | + | ( | 8 100 | x | ) | = | x |
| Left side of the equation = | 99 | ( | 1 | + | 20 100 | ) | + | ( | 8 100 | x | ) |
| = | 99 | × | 1 | + | 99 | × | 20 100 | + | ( | 8 100 | x | ) |
| = | 99 | + | 99 5 | + | ( | 8 100 | x | ) |
| = | 594 5 | + | ( | 8 100 | x | ) |
| = | 594 5 | + | 8 100 | x |
594 5 | + | 8 100 | x | = | x |
8 100 | x | − | x | = | - | 594 5 |
| - | 23 25 | x | = | - | 594 5 |
594 5 | = | 23 25 | x |
23 25 | x | = | 594 5 |
| x | = | 594 5 | ÷ | 23 25 |
| = | 594 5 | × | 25 23 |
| = | 594 | × | 5 23 |
| x | = | 2970 23 |
| x | = | 129.130435 |