| ( | y | − | 750 | ) | ( | 250 | − | 1 | ÷ | 5 | × | y | ) | = | 12000 |
| Left side of the equation = | y | ( | 250 | − | 1 | ÷ | 5 | × | y | ) | − | 750 | ( | 250 | − | 1 | ÷ | 5 | × | y | ) |
| = | y | × | 250 | − | y | × | 1 | ÷ | 5 | × | y | − | 750 | ( | 250 | − | 1 | ÷ | 5 | × | y | ) |
| = | y | × | 250 | − | y | × | 1 5 | y | − | 750 | ( | 250 | − | 1 | ÷ | 5 | × | y | ) |
| = | 250 | y | − | y | × | 1 5 | y | − | 750 | × | 250 | + | 750 | × | 1 | ÷ | 5 | × | y |
| = | 250 | y | − | y | × | 1 5 | y | − | 187500 | + | 150 | y |
| = | 400 | y | − | y | × | 1 5 | y | − | 187500 |
| 400 | y | − | y | × | 1 5 | y | − | 187500 | = | 12000 |