| ( | X | − | 2250 | − | 5000 | − | 1900 | ) | × | 3 100 | = | X | − | 15455 2 | − | 2250 |
| Left side of the equation = | X | × | 3 100 | − | 2250 | × | 3 100 | − | 5000 | × | 3 100 | − | 1900 | × | 3 100 |
| = | X | × | 3 100 | − | 135 2 | − | 150 | − | 57 |
| = | 3 100 | X | − | 549 2 |
3 100 | X | − | 549 2 | = | X | − | 15455 2 | − | 2250 |
| Right side of the equation = | X | − | 19955 2 |
3 100 | X | − | 549 2 | = | X | − | 19955 2 |
3 100 | X | − | X | = | - | 19955 2 | + | 549 2 |
| - | 97 100 | X | = | - | 19955 2 | + | 549 2 |
| - | 97 100 | X | = | - | 9703 |
| 9703 | = | 97 100 | X |
97 100 | X | = | 9703 |
| X | = | 9703 | ÷ | 97 100 |
| = | 9703 | × | 100 97 |
| X | = | 970300 97 |
| X | = | 10003.092784 |