| 84 | = | ( | n | × | 9 | n | × | 6 | n | × | 3 | + | n | × | 8 | n | × | 5 | n | × | 2 | ) | + | ( | n | × | 9 | n | × | 6 | n | × | 2 | − | n | × | 8 | n | × | 5 | n | × | 3 | ) | + | ( | n | × | 8 | n | × | 6 | n | × | 3 | − | n | × | 9 | n | × | 5 | n | × | 2 | ) | + | ( | n | × | 9 | n | × | 5 | n | × | 3 | + | n | × | 8 | n | × | 6 | n | × | 2 | ) |
| Right side of the equation = | n | × | 9 | n | × | 6 | n | × | 3 | + | n | × | 8 | n | × | 5 | n | × | 2 |
| = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | ( | n | × | 9 | n | × | 6 | n | × | 2 | − | n | × | 8 | n | × | 5 | n | × | 3 | ) | + | ( | n | × | 8 | n | × | 6 | n | × | 3 | − | n | × | 9 | n | × | 5 | n | × | 2 | ) | + | ( | n | × | 9 | n | × | 5 | n | × | 3 | + | n | × | 8 | n | × | 6 | n | × | 2 | ) |
| = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | n | × | 9 | n | × | 6 |
| = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | n | × | 108 | n | n |
| = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | n | × | 108 | n | n |
| = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | n | × | 108 | n | n |
| = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | n | × | 108 | n | n |
| = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | n | × | 108 | n | n |
| 84 | = | n | × | 162 | n | n | + | n | × | 80 | n | n | + | n | × | 108 | n | n |