| 75 | − | ( | 73 1000 | a | + | 26 5 | ) | + | 7 100 | a | = | 160 |
| 方程左边 = | 75 | − | 73 1000 | a | − | 26 5 | + | 7 100 | a |
| = | 349 5 | − | 3 1000 | a |
349 5 | − | 3 1000 | a | = | 160 |
| - | 3 1000 | a | = | 160 | − | 349 5 |
| - | 3 1000 | a | = | 451 5 |
| - | 451 5 | = | 3 1000 | a |
3 1000 | a | = | - | 451 5 |
| a | = | - | 451 5 | ÷ | 3 1000 |
| = | - | 451 5 | × | 1000 3 |
| = | - | 451 | × | 200 3 |
| a | = | - | 90200 3 |
| a | = | - 30066.666667 |