| ( | 310 | ( | 1 | + | 20 100 | ) | ) | + | ( | 3 100 | x | ) | = | x |
| Left side of the equation = | 310 | ( | 1 | + | 20 100 | ) | + | ( | 3 100 | x | ) |
| = | 310 | × | 1 | + | 310 | × | 20 100 | + | ( | 3 100 | x | ) |
| = | 310 | + | 62 | + | ( | 3 100 | x | ) |
| = | 372 | + | ( | 3 100 | x | ) |
| = | 372 | + | 3 100 | x |
| 372 | + | 3 100 | x | = | x |
3 100 | x | − | x | = | - | 372 |
| - | 97 100 | x | = | - | 372 |
| 372 | = | 97 100 | x |
97 100 | x | = | 372 |
| x | = | 372 | ÷ | 97 100 |
| = | 372 | × | 100 97 |
| x | = | 37200 97 |
| x | = | 383.505155 |