| a | + | a | × | 44 500 | + | ( | a | + | a | × | 44 500 | ) | × | 7 100 | = | 9129 25 |
| 方程左边 = | 136 125 | a | + | ( | a | + | a | × | 44 500 | ) | × | 7 100 |
136 125 | a | + | ( | a | + | a | × | 44 500 | ) | × | 7 100 | = | 9129 25 |
| 方程左边 = | 136 125 | a | + | a | × | 7 100 | + | a | × | 44 500 | × | 7 100 |
| = | 136 125 | a | + | a | × | 7 100 | + | a | × | 77 12500 |
| = | 3638 3125 | a |
3638 3125 | a | = | 9129 25 |
| a | = | 9129 25 | ÷ | 3638 3125 |
| = | 9129 25 | × | 3125 3638 |
| = | 537 | × | 125 214 |
| a | = | 67125 214 |
| a | = | 313.668224 |