| ( | 1 5 | x | + | 424 | ) | + | ( | 21 100 | x | + | 212 | ) | = | 8330 |
| Left side of the equation = | 1 5 | x | + | 424 | + | ( | 21 100 | x | + | 212 | ) |
| = | 1 5 | x | + | 424 | + | 21 100 | x | + | 212 |
| = | 41 100 | x | + | 636 |
41 100 | x | + | 636 | = | 8330 |
41 100 | x | = | 8330 | − | 636 |
41 100 | x | = | 7694 |
| x | = | 7694 | ÷ | 41 100 |
| = | 7694 | × | 100 41 |
| x | = | 769400 41 |
| x | = | 18765.853659 |