| ( | X | − | 200000 | ) | × | 8 100 | + | 9650 | = | X | × | 6 100 |
| Left side of the equation = | X | × | 8 100 | − | 200000 | × | 8 100 | + | 9650 |
| = | X | × | 8 100 | − | 16000 | + | 9650 |
| = | 8 100 | X | − | 6350 |
8 100 | X | − | 6350 | = | X | × | 6 100 |
8 100 | X | − | 6 100 | X | = | 6350 |
1 50 | X | = | 6350 |
| X | = | 6350 | ÷ | 1 50 |
| = | 6350 | × | 50 |
| X | = | 317500 |