| 9000 | ÷ | 2100 | − | 1500 | = | ( | 9000 | ÷ | 2100 | − | x | ) | × | 2100 |
| Left side of the equation = | 30 7 | − | 1500 |
| = | - | 10470 7 |
| - | 10470 7 | = | ( | 9000 | ÷ | 2100 | − | x | ) | × | 2100 |
| Right side of the equation = | 9000 | ÷ | 2100 | × | 2100 | − | x | × | 2100 |
| = | 9000 | − | x | × | 2100 |
| - | 10470 7 | = | 9000 | − | 2100 | x |
| 2100 | x | = | 9000 | + | 10470 7 |
| 2100 | x | = | 73470 7 |
| x | = | 73470 7 | ÷ | 2100 |
| = | 73470 7 | × | 1 2100 |
| = | 2449 7 | × | 1 70 |
| x | = | 2449 490 |
| x | = | 4.997959 |