| ( | 12 | − | 2 | X | ) | ( | 24 | − | 4 | X | ) | = | 0 |
| Left side of the equation = | 12 | ( | 24 | − | 4 | X | ) | − | 2 | X | ( | 24 | − | 4 | X | ) |
| = | 12 | × | 24 | − | 12 | × | 4 | X | − | 2 | X | ( | 24 | − | 4 | X | ) |
| = | 288 | − | 48 | X | − | 2 | X | ( | 24 | − | 4 | X | ) |
| = | 288 | − | 48 | X | − | 2 | X | × | 24 | + | 2 | X | × | 4 | X |
| = | 288 | − | 48 | X | − | 48 | X | + | 8 | X | X |
| = | 288 | − | 96 | X | + | 8 | X | X |
| 288 | − | 96 | X | + | 8 | X | X | = | 0 |