| 3600 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 3630 |
| Left side of the equation = | 3600 | × | 1 | ( | 1 | + | x | ) | + | 3600 | x | ( | 1 | + | x | ) |
| = | 3600 | ( | 1 | + | x | ) | + | 3600 | x | ( | 1 | + | x | ) |
| = | 3600 | × | 1 | + | 3600 | x | + | 3600 | x | ( | 1 | + | x | ) |
| = | 3600 | + | 3600 | x | + | 3600 | x | ( | 1 | + | x | ) |
| = | 3600 | + | 3600 | x | + | 3600 | x | × | 1 | + | 3600 | x | x |
| = | 3600 | + | 3600 | x | + | 3600 | x | + | 3600 | x | x |
| = | 3600 | + | 7200 | x | + | 3600 | x | x |
| 3600 | + | 7200 | x | + | 3600 | x | x | = | 3630 |