| 1200 | x | = | ( | 2400 | ( | 22 | − | x | ) | ) | ÷ | 2 |
| Right side of the equation = | 2400 | ( | 22 | − | x | ) | × | 1 2 |
| = | 1200 | ( | 22 | − | x | ) |
| = | 1200 | × | 22 | − | 1200 | x |
| = | 26400 | − | 1200 | x |
| 1200 | x | = | 26400 | − | 1200 | x |
| 1200 | x | + | 1200 | x | = | 26400 |
| 2400 | x | = | 26400 |
| x | = | 26400 | ÷ | 2400 |
| = | 26400 | × | 1 2400 |
| = | 11 | × | 1 |
| x | = | 11 |