| 410 | + | ( | 410 | − | 100 | ) | ( | a | × | 1 200 | ) | = | 7553 10 |
| Left side of the equation = | 410 | + | 410 | ( | a | × | 1 200 | ) | − | 100 | ( | a | × | 1 200 | ) |
| = | 410 | + | 410 | a | × | 1 200 | − | 100 | ( | a | × | 1 200 | ) |
| = | 410 | + | 41 20 | a | − | 100 | ( | a | × | 1 200 | ) |
| = | 410 | + | 41 20 | a | − | 100 | a | × | 1 200 |
| = | 410 | + | 41 20 | a | − | 1 2 | a |
| = | 410 | + | 31 20 | a |
| 410 | + | 31 20 | a | = | 7553 10 |
31 20 | a | = | 7553 10 | − | 410 |
31 20 | a | = | 3453 10 |
| a | = | 3453 10 | ÷ | 31 20 |
| = | 3453 10 | × | 20 31 |
| = | 3453 | × | 2 31 |
| a | = | 6906 31 |
| a | = | 222.774194 |