| ( | X | − | 2900 | ) | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) | = | 5000 |
| Left side of the equation = | X | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) | − | 2900 | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) |
| = | X | × | 8 | + | X | × | 4 | ( | 2900 | − | X | ) | ÷ | 50 | − | 2900 | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) |
| = | X | × | 8 | + | X | × | 2 25 | ( | 2900 | − | X | ) | − | 2900 | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) |
| = | 8 | X | + | X | × | 2 25 | × | 2900 | − | X | × | 2 25 | X | − | 2900 | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) |
| = | 8 | X | + | X | × | 232 | − | X | × | 2 25 | X | − | 2900 | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) |
| = | 240 | X | − | X | × | 2 25 | X | − | 2900 | ( | 8 | + | 4 | ( | 2900 | − | X | ) | ÷ | 50 | ) |
| = | 240 | X | − | X | × | 2 25 | X | − | 2900 | × | 8 | − | 2900 | × | 4 | ( | 2900 | − | X | ) | ÷ | 50 |
| = | 240 | X | − | X | × | 2 25 | X | − | 23200 | − | 232 | ( | 2900 | − | X | ) |
| = | 240 | X | − | X | × | 2 25 | X | − | 23200 | − | 232 | × | 2900 | + | 232 | X |
| = | 240 | X | − | X | × | 2 25 | X | − | 23200 | − | 672800 | + | 232 | X |
| = | 472 | X | − | X | × | 2 25 | X | − | 696000 |
| 472 | X | − | X | × | 2 25 | X | − | 696000 | = | 5000 |