| ( | 8100 | + | 65 | + | X | ) | × | 33 1000 | = | 4 | X |
| 方程左边 = | 8100 | × | 33 1000 | + | 65 | × | 33 1000 | + | X | × | 33 1000 |
| = | 2673 10 | + | 429 200 | + | X | × | 33 1000 |
| = | 53889 200 | + | 33 1000 | X |
53889 200 | + | 33 1000 | X | = | 4 | X |
33 1000 | X | − | 4 | X | = | - | 53889 200 |
| - | 3967 1000 | X | = | - | 53889 200 |
53889 200 | = | 3967 1000 | X |
3967 1000 | X | = | 53889 200 |
| X | = | 53889 200 | ÷ | 3967 1000 |
| = | 53889 200 | × | 1000 3967 |
| = | 53889 | × | 5 3967 |
| X | = | 269445 3967 |
| X | = | 67.921603 |