4 5 | × | 909 1000 | ( | 90 | − | x | ) | + | 6 5 | × | 2009 2000 | ( | 20 | − | x | ) | = | 0 |
| 方程左边 = | 909 1250 | ( | 90 | − | x | ) | + | 6027 5000 | ( | 20 | − | x | ) |
909 1250 | ( | 90 | − | x | ) | + | 6027 5000 | ( | 20 | − | x | ) | = | 0 |
| 方程左边 = | 909 1250 | × | 90 | − | 909 1250 | x | + | 6027 5000 | ( | 20 | − | x | ) |
| = | 8181 125 | − | 909 1250 | x | + | 6027 5000 | ( | 20 | − | x | ) |
| = | 8181 125 | − | 909 1250 | x | + | 6027 5000 | × | 20 | − | 6027 5000 | x |
| = | 8181 125 | − | 909 1250 | x | + | 6027 250 | − | 6027 5000 | x |
| = | 22389 250 | − | 9663 5000 | x |
22389 250 | − | 9663 5000 | x | = | 0 |
| - | 9663 5000 | x | = | 0 | − | 22389 250 |
| - | 9663 5000 | x | = | - | 22389 250 |
22389 250 | = | 9663 5000 | x |
9663 5000 | x | = | 22389 250 |
| x | = | 22389 250 | ÷ | 9663 5000 |
| = | 22389 250 | × | 5000 9663 |
| = | 7463 | × | 20 3221 |
| x | = | 149260 3221 |
| x | = | 46.339646 |