| X | × | 10 100 | − | 210 | = | ( | X | − | 60000 | ) | × | 10 100 | − | 2520 |
| Right side of the equation = | X | × | 10 100 | − | 60000 | × | 10 100 | − | 2520 |
| = | X | × | 10 100 | − | 6000 | − | 2520 |
| = | 10 100 | X | − | 8520 |
10 100 | X | − | 210 | = | 10 100 | X | − | 8520 |
10 100 | X | − | 10 100 | X | = | - | 8520 | + | 210 |
| 0 | X | = | - | 8520 | + | 210 |
| 0 | X | = | - | 8310 |