| ( | x | − | 8 100 | ) | ÷ | 30 | = | ( | 10 100 | − | x | ) | − | 360 |
| x | ÷ | 30 | − | 8 100 | ÷ | 30 | = | ( | 10 100 | − | x | ) | − | 360 |
| x | ÷ | 30 | − | 8 100 | ÷ | 30 | = | 10 100 | − | x | − | 360 |
| x | × | 1 30 | − | 1 375 | = | 10 100 | − | x | − | 360 |
1 30 | x | − | 1 375 | = | - | 3599 10 | − | x |
1 30 | x | + | x | = | - | 3599 10 | + | 1 375 |
31 30 | x | = | - | 3599 10 | + | 1 375 |
31 30 | x | = | - | 269923 750 |
| x | = | - | 269923 750 | ÷ | 31 30 |
| = | - | 269923 750 | × | 30 31 |
| = | - | 269923 25 | × | 1 31 |
| x | = | - | 269923 775 |
| x | = | - 348.287742 |