| ( | x | + | 5 | ) | ( | x | + | 499 100 | ) | = | 0 |
| Left side of the equation = | x | ( | x | + | 499 100 | ) | + | 5 | ( | x | + | 499 100 | ) |
| = | x | x | + | x | × | 499 100 | + | 5 | ( | x | + | 499 100 | ) |
| = | x | x | + | 499 100 | x | + | 5 | x | + | 5 | × | 499 100 |
| = | x | x | + | 499 100 | x | + | 5 | x | + | 499 20 |
| = | x | x | + | 999 100 | x | + | 499 20 |
| x | x | + | 999 100 | x | + | 499 20 | = | 0 |