| 500000 | ( | 1 | − | 1 5 | x | ) | + | 8000 | ( | 1 | − | x | ) | × | 20 | ( | 1 | − | 1 | ÷ | 4 | × | x | ) | = | 600000 | − | 4550 | x |
| Left side of the equation = | 500000 | ( | 1 | − | 1 5 | x | ) | + | 160000 | ( | 1 | − | x | ) | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| 500000 | ( | 1 | − | 1 5 | x | ) | + | 160000 | ( | 1 | − | x | ) | ( | 1 | − | 1 | ÷ | 4 | × | x | ) | = | 600000 | − | 4550 | x |
| Left side of the equation = | 500000 | × | 1 | − | 500000 | × | 1 5 | x | + | 160000 | ( | 1 | − | x | ) | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| = | 500000 | − | 100000 | x | + | 160000 | ( | 1 | − | x | ) | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| = | 500000 | − | 100000 | x | + | 160000 | × | 1 | ( | 1 | − | 1 | ÷ | 4 | × | x | ) | − | 160000 | x | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| = | 500000 | − | 100000 | x | + | 160000 | ( | 1 | − | 1 | ÷ | 4 | × | x | ) | − | 160000 | x | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| = | 500000 | − | 100000 | x | + | 160000 | × | 1 | − | 160000 | × | 1 | ÷ | 4 | × | x | − | 160000 | x | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| = | 500000 | − | 100000 | x | + | 160000 | − | 40000 | x | − | 160000 | x | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| = | 660000 | − | 140000 | x | − | 160000 | x | ( | 1 | − | 1 | ÷ | 4 | × | x | ) |
| = | 660000 | − | 140000 | x | − | 160000 | x | × | 1 | + | 160000 | x | × | 1 | ÷ | 4 | × | x |
| = | 660000 | − | 140000 | x | − | 160000 | x | + | 40000 | x | x |
| = | 660000 | − | 300000 | x | + | 40000 | x | x |
| 660000 | − | 300000 | x | + | 40000 | x | x | = | 600000 | − | 4550 | x |