| 180 | ( | 1 | + | x | ) | ( | 1 | + | x | ) | = | 461 |
| Left side of the equation = | 180 | × | 1 | ( | 1 | + | x | ) | + | 180 | x | ( | 1 | + | x | ) |
| = | 180 | ( | 1 | + | x | ) | + | 180 | x | ( | 1 | + | x | ) |
| = | 180 | × | 1 | + | 180 | x | + | 180 | x | ( | 1 | + | x | ) |
| = | 180 | + | 180 | x | + | 180 | x | ( | 1 | + | x | ) |
| = | 180 | + | 180 | x | + | 180 | x | × | 1 | + | 180 | x | x |
| = | 180 | + | 180 | x | + | 180 | x | + | 180 | x | x |
| = | 180 | + | 360 | x | + | 180 | x | x |
| 180 | + | 360 | x | + | 180 | x | x | = | 461 |