| 4 | × | 5 | + | ( | 99999 | × | 9999999999999 | ) | + | ( | 9999999999999 | × | 9999999999999 | ) | = | x |
| Left side of the equation = | 20 | + | ( | 99999 | × | 9999999999999 | ) | + | ( | 9999999999999 | × | 9999999999999 | ) |
| 20 | + | ( | 99999 | × | 9999999999999 | ) | + | ( | 9999999999999 | × | 9999999999999 | ) | = | x |
| Left side of the equation = | 20 | + | 99999 | × | 9999999999999 | + | ( | 9999999999999 | × | 9999999999999 | ) |