| 19 | ( | 7 | x | + | 40 | ) | − | 3805 | = | 19 | x | + | 33 |
| Left side of the equation = | 19 | × | 7 | x | + | 19 | × | 40 | − | 3805 |
| = | 133 | x | + | 760 | − | 3805 |
| = | 133 | x | − | 3045 |
| 133 | x | − | 3045 | = | 19 | x | + | 33 |
| 133 | x | − | 19 | x | = | 33 | + | 3045 |
| 114 | x | = | 33 | + | 3045 |
| 114 | x | = | 3078 |
| x | = | 3078 | ÷ | 114 |
| = | 3078 | × | 1 114 |
| = | 27 | × | 1 |
| x | = | 27 |