| 100 | x | ÷ | 200 | × | ( | 200 | − | x | ) | = | 3 | ÷ | 4 |
| Left side of the equation = | 1 2 | x | ( | 200 | − | x | ) |
1 2 | x | ( | 200 | − | x | ) | = | 3 | ÷ | 4 |
| Left side of the equation = | 1 2 | x | × | 200 | − | 1 2 | x | x |
| = | 100 | x | − | 1 2 | x | x |
| 100 | x | − | 1 2 | x | x | = | 3 | ÷ | 4 |
| Right side of the equation = | 3 4 |
| 100 | x | − | 1 2 | x | x | = | 3 4 |