199 200 | x | + | 19 20 | ( | 18000 | − | x | ) | = | 17550 |
| Left side of the equation = | 199 200 | x | + | 19 20 | × | 18000 | − | 19 20 | x |
| = | 199 200 | x | + | 17100 | − | 19 20 | x |
| = | 9 200 | x | + | 17100 |
9 200 | x | + | 17100 | = | 17550 |
9 200 | x | = | 17550 | − | 17100 |
9 200 | x | = | 450 |
| x | = | 450 | ÷ | 9 200 |
| = | 450 | × | 200 9 |
| = | 50 | × | 200 |
| x | = | 10000 |