| 500 | x | − | ( | 5 | ÷ | 13 | − | x | × | 500 | ) | ( | 5 | ÷ | 13 | − | x | × | 500 | ) | = | 0 |
| Left side of the equation = | 500 | x | − | 5 | ÷ | 13 | × | ( | 5 | ÷ | 13 | − | x | × | 500 | ) | + | x | × | 500 | ( | 5 | ÷ | 13 | − | x | × | 500 | ) |
| = | 500 | x | − | 5 13 | ( | 5 | ÷ | 13 | − | x | × | 500 | ) | + | x | × | 500 | ( | 5 | ÷ | 13 | − | x | × | 500 | ) |
| = | 500 | x | − | 5 13 | × | 5 | ÷ | 13 | + | 5 13 | x | × | 500 | + | x | × | 500 | ( | 5 | ÷ | 13 | − | x | × | 500 | ) |
| = | 500 | x | − | 25 169 | + | 2500 13 | x | + | x | × | 500 | ( | 5 | ÷ | 13 | − | x | × | 500 | ) |
| = | 9000 13 | x | − | 25 169 | + | x | × | 500 | ( | 5 | ÷ | 13 | − | x | × | 500 | ) |
| = | 9000 13 | x | − | 25 169 | + | x | × | 500 | × | 5 | ÷ | 13 | − | x | × | 500 | x | × | 500 |
| = | 9000 13 | x | − | 25 169 | + | x | × | 2500 13 | − | x | × | 250000 | x |
| = | 11500 13 | x | − | 25 169 | − | x | × | 250000 | x |
11500 13 | x | − | 25 169 | − | x | × | 250000 | x | = | 0 |