| 85 | × | 106 | = | 143 10 | × | 120 | x | ( | 280 | − | x | ÷ | 2 | ) |
| Left side of the equation = | 9010 |
| 9010 | = | 143 10 | × | 120 | x | ( | 280 | − | x | ÷ | 2 | ) |
| Right side of the equation = | 1716 | x | ( | 280 | − | x | ÷ | 2 | ) |
| 9010 | = | 1716 | x | ( | 280 | − | x | ÷ | 2 | ) |
| Right side of the equation = | 1716 | x | × | 280 | − | 1716 | x | x | ÷ | 2 |
| = | 480480 | x | − | 858 | x | x |
| 9010 | = | 480480 | x | − | 858 | x | x |