| 8 | ( | 24 | x | + | 30 | ) | − | 7671 | = | 30 | x | + | 21 |
| Left side of the equation = | 8 | × | 24 | x | + | 8 | × | 30 | − | 7671 |
| = | 192 | x | + | 240 | − | 7671 |
| = | 192 | x | − | 7431 |
| 192 | x | − | 7431 | = | 30 | x | + | 21 |
| 192 | x | − | 30 | x | = | 21 | + | 7431 |
| 162 | x | = | 21 | + | 7431 |
| 162 | x | = | 7452 |
| x | = | 7452 | ÷ | 162 |
| = | 7452 | × | 1 162 |
| = | 46 | × | 1 |
| x | = | 46 |