| ( | 1910 | × | 5 | + | 1900 | X | ) | ÷ | ( | X | + | 5 | ) | = | 1900 |
| Multiply both sides of the equation by: | ( | X | + | 5 | ) |
| ( | 1910 | × | 5 | + | 1900 | X | ) | = | 1900 | ( | X | + | 5 | ) |
| 1910 | × | 5 | + | 1900 | X | = | 1900 | ( | X | + | 5 | ) |
| 1910 | × | 5 | + | 1900 | X | = | 1900 | X | + | 1900 | × | 5 |
| 9550 | + | 1900 | X | = | 1900 | X | + | 9500 |
| 1900 | X | − | 1900 | X | = | 9500 | − | 9550 |
| 0 | X | = | 9500 | − | 9550 |
| 0 | X | = | - | 50 |