| ( | 50 | − | 2 | X | ) | ( | 38 | − | 2 | ) | X | + | 1260 | = | 0 |
| Left side of the equation = | 50 | ( | 38 | − | 2 | ) | X | − | 2 | X | ( | 38 | − | 2 | ) | X | + | 1260 |
| = | 50 | × | 38 | X | − | 50 | × | 2 | X | − | 2 | X | ( | 38 | − | 2 | ) | X | + | 1260 |
| = | 1900 | X | − | 100 | X | − | 2 | X | ( | 38 | − | 2 | ) | X | + | 1260 |
| = | 1800 | X | − | 2 | X | ( | 38 | − | 2 | ) | X | + | 1260 |
| = | 1800 | X | − | 2 | X | × | 38 | X | + | 2 | X | × | 2 | X | + | 1260 |
| = | 1800 | X | − | 76 | X | X | + | 4 | X | X | + | 1260 |
| 1800 | X | − | 76 | X | X | + | 4 | X | X | + | 1260 | = | 0 |