| ( | 1 | ÷ | 3 | × | X | − | 200 | ) | × | 1 | ÷ | 4 | = | 1 | ÷ | 5 | × | X |
| Left side of the equation = | ( | 1 | ÷ | 3 | × | X | − | 200 | ) | × | 1 4 |
| ( | 1 | ÷ | 3 | × | X | − | 200 | ) | × | 1 4 | = | 1 | ÷ | 5 | × | X |
| Left side of the equation = | 1 | ÷ | 3 | × | X | × | 1 4 | − | 200 | × | 1 4 |
| = | 1 12 | X | − | 50 |
1 12 | X | − | 50 | = | 1 | ÷ | 5 | × | X |
| Right side of the equation = | 1 5 | X |
1 12 | X | − | 50 | = | 1 5 | X |
1 12 | X | − | 1 5 | X | = | 50 |
| - | 7 60 | X | = | 50 |
| - | 50 | = | 7 60 | X |
7 60 | X | = | - | 50 |
| X | = | - | 50 | ÷ | 7 60 |
| = | - | 50 | × | 60 7 |
| X | = | - | 3000 7 |
| X | = | - 428.571429 |