| 3692360000 | = | 112 5 | × | 2000 | x | ( | 1680 | − | x | ÷ | 2 | ) |
| Right side of the equation = | 44800 | x | ( | 1680 | − | x | ÷ | 2 | ) |
| 3692360000 | = | 44800 | x | ( | 1680 | − | x | ÷ | 2 | ) |
| Right side of the equation = | 44800 | x | × | 1680 | − | 44800 | x | x | ÷ | 2 |
| = | 75264000 | x | − | 22400 | x | x |
| 3692360000 | = | 75264000 | x | − | 22400 | x | x |