| 105000000 | = | 48 5 | × | 200 | x | ( | 540 | − | 1 2 | x | ) | + | 48 5 | × | 1800 | × | 80 | × | 500 |
| Right side of the equation = | 1920 | x | ( | 540 | − | 1 2 | x | ) | + | 691200000 |
| 105000000 | = | 1920 | x | ( | 540 | − | 1 2 | x | ) | + | 691200000 |
| Right side of the equation = | 1920 | x | × | 540 | − | 1920 | x | × | 1 2 | x | + | 691200000 |
| = | 1036800 | x | − | 960 | x | x | + | 691200000 |
| 105000000 | = | 1036800 | x | − | 960 | x | x | + | 691200000 |