3 250 | ( | 27 50 | − | a | ) | = | 13 1000 | ( | a | − | 59 100 | ) |
| 方程左边 = | 3 250 | × | 27 50 | − | 3 250 | a |
| = | 81 12500 | − | 3 250 | a |
81 12500 | − | 3 250 | a | = | 13 1000 | ( | a | − | 59 100 | ) |
| 方程右边 = | 13 1000 | a | − | 13 1000 | × | 59 100 |
| = | 13 1000 | a | − | 767 100000 |
81 12500 | − | 3 250 | a | = | 13 1000 | a | − | 767 100000 |
| - | 3 250 | a | − | 13 1000 | a | = | - | 767 100000 | − | 81 12500 |
| - | 1 40 | a | = | - | 767 100000 | − | 81 12500 |
| - | 1 40 | a | = | - | 283 20000 |
283 20000 | = | 1 40 | a |
1 40 | a | = | 283 20000 |
| a | = | 283 20000 | ÷ | 1 40 |
| = | 283 20000 | × | 40 |
| = | 283 500 | × | 1 |
| a | = | 283 500 |
| a | = | 0.566 |