| ( | x | − | 6 | ) | ( | - | 200 | x | + | 2200 | ) | = | 0 |
| Left side of the equation = | x | ( | - | 200 | x | + | 2200 | ) | − | 6 | ( | - | 200 | x | + | 2200 | ) |
| = | - | x | × | 200 | x | + | x | × | 2200 | − | 6 | ( | - | 200 | x | + | 2200 | ) |
| = | - | x | × | 200 | x | + | 2200 | x | + | 6 | × | 200 | x | − | 6 | × | 2200 |
| = | - | x | × | 200 | x | + | 2200 | x | + | 1200 | x | − | 13200 |
| = | - | x | × | 200 | x | + | 3400 | x | − | 13200 |
| - | x | × | 200 | x | + | 3400 | x | − | 13200 | = | 0 |