| ( | ( | X | + | 3900 | ) | ÷ | 3900 | ) | × | 397 1000 | = | 12 |
| Left side of the equation = | ( | X | + | 3900 | ) | ÷ | 3900 | × | 397 1000 |
| = | ( | X | + | 3900 | ) | × | 397 3900000 |
| = | X | × | 397 3900000 | + | 3900 | × | 397 3900000 |
| = | X | × | 397 3900000 | + | 397 1000 |
397 3900000 | X | + | 397 1000 | = | 12 |
397 3900000 | X | = | 12 | − | 397 1000 |
397 3900000 | X | = | 11603 1000 |
| X | = | 11603 1000 | ÷ | 397 3900000 |
| = | 11603 1000 | × | 3900000 397 |
| = | 11603 | × | 3900 397 |
| X | = | 45251700 397 |
| X | = | 113984.130982 |