| 100 | ( | 1000 | + | 40 | x | ) | + | 2 | × | 1000 | x | = | 0 |
| Left side of the equation = | 100 | ( | 1000 | + | 40 | x | ) | + | 2000 | x |
| 100 | ( | 1000 | + | 40 | x | ) | + | 2000 | x | = | 0 |
| Left side of the equation = | 100 | × | 1000 | + | 100 | × | 40 | x | + | 2000 | x |
| = | 100000 | + | 4000 | x | + | 2000 | x |
| = | 100000 | + | 6000 | x |
| 100000 | + | 6000 | x | = | 0 |
| 6000 | x | = | 0 | − | 100000 |
| 6000 | x | = | - | 100000 |
| x | = | - | 100000 | ÷ | 6000 |
| = | - | 100000 | × | 1 6000 |
| = | - | 50 | × | 1 3 |
| x | = | - | 50 3 |
| x | = | - 16.666667 |