| - | 4082750 | + | 3000000 | − | 12000000 | × | 12 100 | ÷ | 4 | − | 3000000 | × | 12 100 | ÷ | 4 | − | x | × | 10 100 | ÷ | 4 | = | 300000 |
| Left side of the equation = | - | 4082750 | + | 3000000 | − | 360000 | − | 90000 | − | x | × | 1 40 |
| = | - | 1532750 | − | 1 40 | x |
| - | 1532750 | − | 1 40 | x | = | 300000 |
| - | 1 40 | x | = | 300000 | + | 1532750 |
| - | 1 40 | x | = | 1832750 |
| - | 1832750 | = | 1 40 | x |
1 40 | x | = | - | 1832750 |
| x | = | - | 1832750 | ÷ | 1 40 |
| = | - | 1832750 | × | 40 |
| x | = | - | 73310000 |