| x | ( | 200 | − | 500 | ) | − | 1180 | = | 500 |
| Left side of the equation = | x | × | 200 | − | x | × | 500 | − | 1180 |
| = | - | 300 | x | − | 1180 |
| - | 300 | x | − | 1180 | = | 500 |
| - | 300 | x | = | 500 | + | 1180 |
| - | 300 | x | = | 1680 |
| - | 1680 | = | 300 | x |
| 300 | x | = | - | 1680 |
| x | = | - | 1680 | ÷ | 300 |
| = | - | 1680 | × | 1 300 |
| = | - | 28 | × | 1 5 |
| x | = | - | 28 5 |
| x | = | - 5.6 |