| ( | x | + | 80 100 | ) | + | ( | ( | x | + | 80 100 | ) | + | 80 100 | ) | + | 15000 | = | 73000 |
| 方程左边 = | x | + | 80 100 | + | ( | ( | x | + | 80 100 | ) | + | 80 100 | ) | + | 15000 |
| = | x | + | 75004 5 | + | ( | ( | x | + | 80 100 | ) | + | 80 100 | ) |
| = | x | + | 75004 5 | + | ( | x | + | 80 100 | ) | + | 80 100 |
| = | x | + | 75008 5 | + | ( | x | + | 80 100 | ) |
| = | x | + | 75008 5 | + | x | + | 80 100 |
| = | 2 | x | + | 75012 5 |
| 2 | x | + | 75012 5 | = | 73000 |
| 2 | x | = | 73000 | − | 75012 5 |
| 2 | x | = | 289988 5 |
| x | = | 289988 5 | ÷ | 2 |
| = | 289988 5 | × | 1 2 |
| = | 144994 5 | × | 1 |
| x | = | 144994 5 |
| x | = | 28998.8 |