| 150 | ( | x | + | 27 50 | ) | = | 4 | × | 150 | x |
| Left side of the equation = | 150 | x | + | 150 | × | 27 50 |
| = | 150 | x | + | 81 |
| 150 | x | + | 81 | = | 4 | × | 150 | x |
| Right side of the equation = | 600 | x |
| 150 | x | + | 81 | = | 600 | x |
| 150 | x | − | 600 | x | = | - | 81 |
| - | 450 | x | = | - | 81 |
| 81 | = | 450 | x |
| 450 | x | = | 81 |
| x | = | 81 | ÷ | 450 |
| = | 81 | × | 1 450 |
| = | 9 | × | 1 50 |
| x | = | 9 50 |
| x | = | 0.18 |