| 560 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 2660 |
| Left side of the equation = | 560 | × | 1 | ( | 1 | + | x | ) | + | 560 | x | ( | 1 | + | x | ) |
| = | 560 | ( | 1 | + | x | ) | + | 560 | x | ( | 1 | + | x | ) |
| = | 560 | × | 1 | + | 560 | x | + | 560 | x | ( | 1 | + | x | ) |
| = | 560 | + | 560 | x | + | 560 | x | ( | 1 | + | x | ) |
| = | 560 | + | 560 | x | + | 560 | x | × | 1 | + | 560 | x | x |
| = | 560 | + | 560 | x | + | 560 | x | + | 560 | x | x |
| = | 560 | + | 1120 | x | + | 560 | x | x |
| 560 | + | 1120 | x | + | 560 | x | x | = | 2660 |