| 10 | − | x | ÷ | 10 | − | 15 | = | 8300 | ÷ | 12210 |
| Left side of the equation = | - | 5 | − | 1 10 | x |
| - | 5 | − | 1 10 | x | = | 8300 | ÷ | 12210 |
| Right side of the equation = | 830 1221 |
| - | 5 | − | 1 10 | x | = | 830 1221 |
| - | 1 10 | x | = | 830 1221 | + | 5 |
| - | 1 10 | x | = | 6935 1221 |
| - | 6935 1221 | = | 1 10 | x |
1 10 | x | = | - | 6935 1221 |
| x | = | - | 6935 1221 | ÷ | 1 10 |
| = | - | 6935 1221 | × | 10 |
| x | = | - | 69350 1221 |
| x | = | - 56.797707 |