| ( | 54 | ( | 1 | + | 15 100 | ) | ) | + | ( | 3 100 | x | ) | = | x |
| Left side of the equation = | 54 | ( | 1 | + | 15 100 | ) | + | ( | 3 100 | x | ) |
| = | 54 | × | 1 | + | 54 | × | 15 100 | + | ( | 3 100 | x | ) |
| = | 54 | + | 81 10 | + | ( | 3 100 | x | ) |
| = | 621 10 | + | ( | 3 100 | x | ) |
| = | 621 10 | + | 3 100 | x |
621 10 | + | 3 100 | x | = | x |
3 100 | x | − | x | = | - | 621 10 |
| - | 97 100 | x | = | - | 621 10 |
621 10 | = | 97 100 | x |
97 100 | x | = | 621 10 |
| x | = | 621 10 | ÷ | 97 100 |
| = | 621 10 | × | 100 97 |
| = | 621 | × | 10 97 |
| x | = | 6210 97 |
| x | = | 64.020619 |