| ( | 16 | + | y | ) | ( | 16 | + | y | ) | + | y | = | 28 |
| Left side of the equation = | 16 | ( | 16 | + | y | ) | + | y | ( | 16 | + | y | ) | + | y |
| = | 16 | × | 16 | + | 16 | y | + | y | ( | 16 | + | y | ) | + | y |
| = | 256 | + | 16 | y | + | y | ( | 16 | + | y | ) | + | y |
| = | 256 | + | 17 | y | + | y | ( | 16 | + | y | ) |
| = | 256 | + | 17 | y | + | y | × | 16 | + | y | y |
| = | 256 | + | 33 | y | + | y | y |
| 256 | + | 33 | y | + | y | y | = | 28 |