| ( | 2100 | × | 12 | × | 90 100 | − | 70 100 | × | 110 | X | × | 631 10000 | ) | ÷ | ( | 30 100 | × | 110 | X | + | 5 100 | × | 110 | X | ) | = | 19 500 |
| 方程两边同时乘以: | ( | 30 100 | × | 110 | X | + | 5 100 | × | 110 | X | ) |
| ( | 2100 | × | 12 | × | 90 100 | − | 70 100 | × | 110 | X | × | 631 10000 | ) | = | 19 500 | ( | 30 100 | × | 110 | X | + | 5 100 | × | 110 | X | ) |
| 2100 | × | 12 | × | 90 100 | − | 70 100 | × | 110 | X | × | 631 10000 | = | 19 500 | ( | 30 100 | × | 110 | X | + | 5 100 | × | 110 | X | ) |
| 2100 | × | 12 | × | 90 100 | − | 70 100 | × | 110 | X | × | 631 10000 | = | 19 500 | × | 30 100 | × | 110 | X | + | 19 500 | × | 5 100 | × | 110 | X |
| 22680 | − | 48587 10000 | X | = | 627 500 | X | + | 209 1000 | X |
| 22680 | − | 48587 10000 | X | = | 1463 1000 | X |
| - | 48587 10000 | X | − | 1463 1000 | X | = | - | 22680 |
| - | 63217 10000 | X | = | - | 22680 |
| 22680 | = | 63217 10000 | X |
63217 10000 | X | = | 22680 |
| X | = | 22680 | ÷ | 63217 10000 |
| = | 22680 | × | 10000 63217 |
| = | 3240 | × | 10000 9031 |
| X | = | 32400000 9031 |
| X | = | 3587.642565 |