| X | − | X | ÷ | 21 20 | × | 3 200 | − | X | ÷ | 21 20 | × | 3 200 | × | 7 10 | × | 1 2 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 50 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | = | 27600 |
| Left side of the equation = | X | − | X | × | 1 70 | − | X | × | 1 200 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 50 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 200 |
| = | 1373 1400 | X | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 50 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 200 |
1373 1400 | X | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 50 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 200 | = | 27600 |
| Left side of the equation = | 1373 1400 | X | − | X | × | 1 50 | + | X | ÷ | 21 20 | × | 3 200 | × | 1 50 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 200 |
| = | 1373 1400 | X | − | X | × | 1 50 | + | X | × | 1 3500 | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 200 |
| = | 961 1000 | X | − | ( | X | − | X | ÷ | 21 20 | × | 3 200 | ) | × | 1 200 |
| = | 961 1000 | X | − | X | × | 1 200 | + | X | ÷ | 21 20 | × | 3 200 | × | 1 200 |
| = | 961 1000 | X | − | X | × | 1 200 | + | X | × | 1 14000 |
| = | 2677 2800 | X |
2677 2800 | X | = | 27600 |
| X | = | 27600 | ÷ | 2677 2800 |
| = | 27600 | × | 2800 2677 |
| X | = | 77280000 2677 |
| X | = | 28868.135973 |