| ( | x | − | 250 | ) | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) | = | 0 |
| Left side of the equation = | x | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) | − | 250 | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) |
| = | x | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | x | × | 8 | − | 250 | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) |
| = | x | ( | 290 | − | x | ) | × | 4 5 | + | x | × | 8 | − | 250 | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) |
| = | x | × | 290 | × | 4 5 | − | x | x | × | 4 5 | + | 8 | x | − | 250 | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) |
| = | x | × | 232 | − | x | x | × | 4 5 | + | 8 | x | − | 250 | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) |
| = | 240 | x | − | x | x | × | 4 5 | − | 250 | ( | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | + | 8 | ) |
| = | 240 | x | − | x | x | × | 4 5 | − | 250 | ( | 290 | − | x | ) | ÷ | 5 | × | 4 | − | 250 | × | 8 |
| = | 240 | x | − | x | x | × | 4 5 | − | 200 | ( | 290 | − | x | ) | − | 2000 |
| = | 240 | x | − | x | x | × | 4 5 | − | 200 | × | 290 | + | 200 | x | − | 2000 |
| = | 240 | x | − | x | x | × | 4 5 | − | 58000 | + | 200 | x | − | 2000 |
| = | 440 | x | − | x | x | × | 4 5 | − | 60000 |
| 440 | x | − | x | x | × | 4 5 | − | 60000 | = | 0 |