| 15 | + | ( | x | × | 27 25 | + | 5 2 | ) | + | 3 20 | x | + | ( | 15 | × | 331 2000 | ) | = | 19647 100 |
| 方程左边 = | 15 | + | x | × | 27 25 | + | 5 2 | + | 3 20 | x | + | ( | 15 | × | 331 2000 | ) |
| = | 35 2 | + | 123 100 | x | + | ( | 15 | × | 331 2000 | ) |
| = | 35 2 | + | 123 100 | x | + | 15 | × | 331 2000 |
| = | 35 2 | + | 123 100 | x | + | 993 400 |
| = | 7993 400 | + | 123 100 | x |
7993 400 | + | 123 100 | x | = | 19647 100 |
123 100 | x | = | 19647 100 | − | 7993 400 |
123 100 | x | = | 14119 80 |
| x | = | 14119 80 | ÷ | 123 100 |
| = | 14119 80 | × | 100 123 |
| = | 14119 4 | × | 5 123 |
| x | = | 70595 492 |
| x | = | 143.485772 |