| ( | ( | X | − | 7 5000 | ) | × | 343 1000 | ) | ÷ | 1 2 | × | 100 | = | 217 100 |
| 方程左边 = | ( | ( | X | − | 7 5000 | ) | × | 343 1000 | ) | × | 200 |
| ( | ( | X | − | 7 5000 | ) | × | 343 1000 | ) | × | 200 | = | 217 100 |
| 方程左边 = | ( | X | − | 7 5000 | ) | × | 343 1000 | × | 200 |
| = | ( | X | − | 7 5000 | ) | × | 343 5 |
| = | X | × | 343 5 | − | 7 5000 | × | 343 5 |
| = | X | × | 343 5 | − | 2401 25000 |
343 5 | X | − | 2401 25000 | = | 217 100 |
343 5 | X | = | 217 100 | + | 2401 25000 |
343 5 | X | = | 56651 25000 |
| X | = | 56651 25000 | ÷ | 343 5 |
| = | 56651 25000 | × | 5 343 |
| = | 8093 5000 | × | 1 49 |
| X | = | 8093 245000 |
| X | = | 0.033033 |