| 3000 | + | 4000 | x | = | 2400 | x | − | 20000 | ÷ | 200 |
| Right side of the equation = | 2400 | x | − | 100 |
| 3000 | + | 4000 | x | = | 2400 | x | − | 100 |
| 4000 | x | − | 2400 | x | = | - | 100 | − | 3000 |
| 1600 | x | = | - | 100 | − | 3000 |
| 1600 | x | = | - | 3100 |
| x | = | - | 3100 | ÷ | 1600 |
| = | - | 3100 | × | 1 1600 |
| = | - | 31 | × | 1 16 |
| x | = | - | 31 16 |
| x | = | - 1.9375 |