| ( | 64 | − | x | ) | ÷ | 4 | = | ( | 28 | − | x | ) | ÷ | 4 |
| Left side of the equation = | 64 | × | 1 4 | − | x | × | 1 4 |
| = | 16 | − | x | × | 1 4 |
| 16 | − | 1 4 | x | = | ( | 28 | − | x | ) | ÷ | 4 |
| Right side of the equation = | 28 | × | 1 4 | − | x | × | 1 4 |
| = | 7 | − | x | × | 1 4 |
| 16 | − | 1 4 | x | = | 7 | − | 1 4 | x |
| - | 1 4 | x | + | 1 4 | x | = | 7 | − | 16 |
| - | 0 | x | = | 7 | − | 16 |
| - | 0 | x | = | - | 9 |