| 1100 | = | a | ÷ | ( | 400 | + | ( | a | − | 3 5 | ) | ÷ | 1000 | ) |
| Multiply both sides of the equation by: | ( | 400 | + | ( | a | − | 3 5 | ) | ÷ | 1000 | ) |
| 1100 | ( | 400 | + | ( | a | − | 3 5 | ) | ÷ | 1000 | ) | = | a |
| 1100 | × | 400 | + | 1100 | ( | a | − | 3 5 | ) | ÷ | 1000 | = | a |
| 440000 | + | 11 10 | ( | a | − | 3 5 | ) | = | a |
| 440000 | + | 11 10 | a | − | 11 10 | × | 3 5 | = | a |
| 440000 | + | 11 10 | a | − | 33 50 | = | a |
21999967 50 | + | 11 10 | a | = | a |
11 10 | a | − | a | = | - | 21999967 50 |
1 10 | a | = | - | 21999967 50 |
| a | = | - | 21999967 50 | ÷ | 1 10 |
| = | - | 21999967 50 | × | 10 |
| = | - | 21999967 5 | × | 1 |
| a | = | - | 21999967 5 |
| a | = | - 4399993.4 |