| ( | 29 | + | 2 | X | ) | ( | 22 | + | 2 | X | ) | − | 29 | × | 22 | = | 1 | ÷ | 4 | × | 29 | × | 22 |
| Left side of the equation = | ( | 29 | + | 2 | X | ) | ( | 22 | + | 2 | X | ) | − | 638 |
| ( | 29 | + | 2 | X | ) | ( | 22 | + | 2 | X | ) | − | 638 | = | 1 | ÷ | 4 | × | 29 | × | 22 |
| Left side of the equation = | 29 | ( | 22 | + | 2 | X | ) | + | 2 | X | ( | 22 | + | 2 | X | ) | − | 638 |
| = | 29 | × | 22 | + | 29 | × | 2 | X | + | 2 | X | ( | 22 | + | 2 | X | ) | − | 638 |
| = | 638 | + | 58 | X | + | 2 | X | ( | 22 | + | 2 | X | ) | − | 638 |
| = | 0 | + | 58 | X | + | 2 | X | ( | 22 | + | 2 | X | ) |
| = | 0 | + | 58 | X | + | 2 | X | × | 22 | + | 2 | X | × | 2 | X |
| = | 0 | + | 58 | X | + | 44 | X | + | 4 | X | X |
| = | 0 | + | 102 | X | + | 4 | X | X |
| 0 | + | 102 | X | + | 4 | X | X | = | 1 | ÷ | 4 | × | 29 | × | 22 |
| Right side of the equation = | 319 2 |
| 0 | + | 102 | X | + | 4 | X | X | = | 319 2 |