| - | 540000 | x | ( | 900 | x | + | 180000 | ) | × | 3 | − | 1800 | x | × | 2 | ( | 900 | x | + | 180000 | ) | × | 3 | + | 2 | x | ( | 900 | x | + | 180000 | ) | = | 0 |
| Left side of the equation = | - | 1620000 | x | ( | 900 | x | + | 180000 | ) | − | 10800 | x | ( | 900 | x | + | 180000 | ) | + | 4 | x | ( | 900 | x | + | 180000 | ) | + | 600 | ( | 900 | x | + | 180000 | ) |
| - | 1620000 | x | ( | 900 | x | + | 180000 | ) | − | 10800 | x | ( | 900 | x | + | 180000 | ) | + | 4 | x | ( | 900 | x | + | 180000 | ) | + | 600 | ( | 900 | x | + | 180000 | ) | = | 0 |
| Left side of the equation = | - | 1620000 | x | × | 900 | x | − | 1620000 | x | × | 180000 | − | 10800 | x | ( | 900 | x | + | 180000 | ) | + | 4 | x |