| - | ( | - | 2 | ( | m | + | 1 | ) | ) | ÷ | 1 | − | ( | m | × | 2 | + | 5 | ) | + | 1 | = | 28 |
| Left side of the equation = | 2 | ( | m | + | 1 | ) | × | 1 | − | ( | m | × | 2 | + | 5 | ) | + | 1 |
| = | 2 | ( | m | + | 1 | ) | − | ( | m | × | 2 | + | 5 | ) | + | 1 |
| = | 2 | m | + | 2 | × | 1 | − | ( | m | × | 2 | + | 5 | ) | + | 1 |
| = | 2 | m | + | 2 | − | ( | m | × | 2 | + | 5 | ) | + | 1 |
| = | 2 | m | + | 3 | − | ( | m | × | 2 | + | 5 | ) |
| = | 2 | m | + | 3 | − | m | × | 2 | − | 5 |
| = | 0 | m | − | 2 |
| 0 | m | − | 2 | = | 28 |
| = | 28 | + | 2 |