| ( | 1 | ÷ | 49 | − | x | ) | ( | 1 | + | x | ) | = | 1 | ÷ | 499 |
| Left side of the equation = | 1 | ÷ | 49 | × | ( | 1 | + | x | ) | − | x | ( | 1 | + | x | ) |
| = | 1 49 | ( | 1 | + | x | ) | − | x | ( | 1 | + | x | ) |
| = | 1 49 | × | 1 | + | 1 49 | x | − | x | ( | 1 | + | x | ) |
| = | 1 49 | + | 1 49 | x | − | x | ( | 1 | + | x | ) |
| = | 1 49 | + | 1 49 | x | − | x | × | 1 | − | x | x |
| = | 1 49 | − | 48 49 | x | − | x | x |
1 49 | − | 48 49 | x | − | x | x | = | 1 | ÷ | 499 |
| Right side of the equation = | 1 499 |
1 49 | − | 48 49 | x | − | x | x | = | 1 499 |