| ( | 100 | − | x | ) | ( | 5 | x | + | 3000 | ) | = | 32000 |
| Left side of the equation = | 100 | ( | 5 | x | + | 3000 | ) | − | x | ( | 5 | x | + | 3000 | ) |
| = | 100 | × | 5 | x | + | 100 | × | 3000 | − | x | ( | 5 | x | + | 3000 | ) |
| = | 500 | x | + | 300000 | − | x | ( | 5 | x | + | 3000 | ) |
| = | 500 | x | + | 300000 | − | x | × | 5 | x | − | x | × | 3000 |
| = | - | 2500 | x | + | 300000 | − | x | × | 5 | x |
| - | 2500 | x | + | 300000 | − | x | × | 5 | x | = | 32000 |