| 10000 | ÷ | 90 | × | ( | x | + | 17921 1000 | ) | + | ( | 150 | − | 10000 | ÷ | 90 | ) | x | = | 20000 |
| 方程左边 = | 1000 9 | ( | x | + | 17921 1000 | ) | + | ( | 150 | − | 10000 | ÷ | 90 | ) | x |
1000 9 | ( | x | + | 17921 1000 | ) | + | ( | 150 | − | 10000 | ÷ | 90 | ) | x | = | 20000 |
| 方程左边 = | 1000 9 | x | + | 1000 9 | × | 17921 1000 | + | ( | 150 | − | 10000 | ÷ | 90 | ) | x |
| = | 1000 9 | x | + | 17921 9 | + | ( | 150 | − | 10000 | ÷ | 90 | ) | x |
| = | 1000 9 | x | + | 17921 9 | + | 150 | x | − | 10000 | ÷ | 90 | × | x |
| = | 1000 9 | x | + | 17921 9 | + | 150 | x | − | 1000 9 | x |
| = | 150 | x | + | 17921 9 |
| 150 | x | + | 17921 9 | = | 20000 |
| 150 | x | = | 20000 | − | 17921 9 |
| 150 | x | = | 162079 9 |
| x | = | 162079 9 | ÷ | 150 |
| = | 162079 9 | × | 1 150 |
| x | = | 162079 1350 |
| x | = | 120.058519 |