| ( | - | 3600 | − | 3600 | x | ) | ÷ | ( | 18180000 | + | 180 | x | ) | = | 1 400 |
| Multiply both sides of the equation by: | ( | 18180000 | + | 180 | x | ) |
| ( | - | 3600 | − | 3600 | x | ) | = | 1 400 | ( | 18180000 | + | 180 | x | ) |
| - | 3600 | − | 3600 | x | = | 1 400 | ( | 18180000 | + | 180 | x | ) |
| - | 3600 | − | 3600 | x | = | 1 400 | × | 18180000 | + | 1 400 | × | 180 | x |
| - | 3600 | − | 3600 | x | = | 45450 | + | 9 20 | x |
| - | 3600 | x | − | 9 20 | x | = | 45450 | + | 3600 |
| - | 72009 20 | x | = | 45450 | + | 3600 |
| - | 72009 20 | x | = | 49050 |
| - | 49050 | = | 72009 20 | x |
72009 20 | x | = | - | 49050 |
| x | = | - | 49050 | ÷ | 72009 20 |
| = | - | 49050 | × | 20 72009 |
| = | - | 5450 | × | 20 8001 |
| x | = | - | 109000 8001 |
| x | = | - 13.623297 |