| 600 | ( | a | − | 30 | ) | = | 7260 | a |
| Left side of the equation = | 600 | a | − | 600 | × | 30 |
| = | 600 | a | − | 18000 |
| 600 | a | − | 18000 | = | 7260 | a |
| 600 | a | − | 7260 | a | = | 18000 |
| - | 6660 | a | = | 18000 |
| - | 18000 | = | 6660 | a |
| 6660 | a | = | - | 18000 |
| a | = | - | 18000 | ÷ | 6660 |
| = | - | 18000 | × | 1 6660 |
| = | - | 100 | × | 1 37 |
| a | = | - | 100 37 |
| a | = | - 2.702703 |