| ( | 1 | + | 500 | ÷ | 1000 | + | X | ÷ | 1650 | + | 360 | ÷ | 108 | ) | × | 1000 | = | 3 | ( | 1580 | + | X | ) |
| 方程左边 = | 1 | × | 1000 | + | 500 | ÷ | 1000 | × | 1000 | + | X | ÷ | 1650 | × | 1000 | + | 360 | ÷ | 108 | × | 1000 |
| = | 1000 | + | 500 | + | X | × | 20 33 | + | 10000 3 |
| = | 14500 3 | + | 20 33 | X |
14500 3 | + | 20 33 | X | = | 3 | ( | 1580 | + | X | ) |
| 方程右边 = | 3 | × | 1580 | + | 3 | X |
| = | 4740 | + | 3 | X |
14500 3 | + | 20 33 | X | = | 4740 | + | 3 | X |
20 33 | X | − | 3 | X | = | 4740 | − | 14500 3 |
| - | 79 33 | X | = | 4740 | − | 14500 3 |
| - | 79 33 | X | = | - | 280 3 |
280 3 | = | 79 33 | X |
79 33 | X | = | 280 3 |
| X | = | 280 3 | ÷ | 79 33 |
| = | 280 3 | × | 33 79 |
| = | 280 | × | 11 79 |
| X | = | 3080 79 |
| X | = | 38.987342 |