| 2500 | × | 2500 | = | a | a | ( | a | a | + | 25 | ) | ( | a | a | + | 2500 | ) |
| Left side of the equation = | 6250000 |
| 6250000 | = | a | a | ( | a | a | + | 25 | ) | ( | a | a | + | 2500 | ) |
| Right side of the equation = | a | a | a | a | ( | a | a | + | 2500 | ) | + | a | a | × | 25 | ( | a | a | + | 2500 | ) |
| = | a | a | a | a | a | a | + | a | a | a | a | × | 2500 | + | a |
| = | a | a | a | a | a | a | + | a | a | a | a | × | 2500 | + | a |
| = | a | a | a | a | a | a | + | a | a | a | a | × | 2500 | + | a |
| 6250000 | = | a | a | a | a | a | a | + | a | a | a | a | × | 2500 | + | a |