| ( | x | − | 15000 | ) | × | 3 10 | − | 10000 | − | x | × | 3 125 | = | 0 |
| 方程左边 = | x | × | 3 10 | − | 15000 | × | 3 10 | − | 10000 | − | 3 125 | x |
| = | x | × | 3 10 | − | 4500 | − | 10000 | − | 3 125 | x |
| = | 69 250 | x | − | 14500 |
69 250 | x | − | 14500 | = | 0 |
69 250 | x | = | 0 | + | 14500 |
69 250 | x | = | 14500 |
| x | = | 14500 | ÷ | 69 250 |
| = | 14500 | × | 250 69 |
| x | = | 3625000 69 |
| x | = | 52536.231884 |