| ( | X | + | 1 2 | ) | × | 6 5 | × | 1 10 | = | 63 100 |
| 方程左边 = | ( | X | + | 1 2 | ) | × | 3 25 |
| ( | X | + | 1 2 | ) | × | 3 25 | = | 63 100 |
| 方程左边 = | X | × | 3 25 | + | 1 2 | × | 3 25 |
| = | X | × | 3 25 | + | 3 50 |
3 25 | X | + | 3 50 | = | 63 100 |
3 25 | X | = | 63 100 | − | 3 50 |
3 25 | X | = | 57 100 |
| X | = | 57 100 | ÷ | 3 25 |
| = | 57 100 | × | 25 3 |
| = | 19 4 | × | 1 |
| X | = | 19 4 |
| X | = | 4.75 |