| 30879 | − | 36 | x | = | 9 | ( | 37 | x | + | 28 | ) |
| Right side of the equation = | 9 | × | 37 | x | + | 9 | × | 28 |
| = | 333 | x | + | 252 |
| 30879 | − | 36 | x | = | 333 | x | + | 252 |
| - | 36 | x | − | 333 | x | = | 252 | − | 30879 |
| - | 369 | x | = | 252 | − | 30879 |
| - | 369 | x | = | - | 30627 |
| 30627 | = | 369 | x |
| 369 | x | = | 30627 |
| x | = | 30627 | ÷ | 369 |
| = | 30627 | × | 1 369 |
| = | 83 | × | 1 |
| x | = | 83 |