| 30148 | − | 17 | x | = | 16 | ( | 21 | x | + | 31 | ) |
| Right side of the equation = | 16 | × | 21 | x | + | 16 | × | 31 |
| = | 336 | x | + | 496 |
| 30148 | − | 17 | x | = | 336 | x | + | 496 |
| - | 17 | x | − | 336 | x | = | 496 | − | 30148 |
| - | 353 | x | = | 496 | − | 30148 |
| - | 353 | x | = | - | 29652 |
| 29652 | = | 353 | x |
| 353 | x | = | 29652 |
| x | = | 29652 | ÷ | 353 |
| = | 29652 | × | 1 353 |
| x | = | 29652 353 |
| x | = | 84 |