| ( | X | − | 600 | ) | ( | - | 1 | ÷ | 8 | × | X | + | 30 | ) | + | 240 | = | 1000 |
| Left side of the equation = | X | ( | - | 1 | ÷ | 8 | × | X | + | 30 | ) | − | 600 | ( | - | 1 | ÷ | 8 | × | X | + | 30 | ) | + | 240 |
| = | - | X | × | 1 | ÷ | 8 | × | X | + | X | × | 30 | − | 600 | ( | - | 1 | ÷ | 8 | × | X | + | 30 | ) | + | 240 |
| = | - | X | × | 1 8 | X | + | X | × | 30 | − | 600 | ( | - | 1 | ÷ | 8 | × | X | + | 30 | ) | + | 240 |
| = | - | X | × | 1 8 | X | + | 30 | X | + | 600 | × | 1 | ÷ | 8 | × | X | − | 600 | × | 30 | + | 240 |
| = | - | X | × | 1 8 | X | + | 30 | X | + | 75 | X | − | 18000 | + | 240 |
| = | - | X | × | 1 8 | X | + | 105 | X | − | 17760 |
| - | X | × | 1 8 | X | + | 105 | X | − | 17760 | = | 1000 |