| ( | 223532 25 | + | 15 | + | X | ) | × | 31 1000 | = | 4 | X |
| 方程左边 = | 223532 25 | × | 31 1000 | + | 15 | × | 31 1000 | + | X | × | 31 1000 |
| = | 1732373 6250 | + | 93 200 | + | X | × | 31 1000 |
| = | 6941117 25000 | + | 31 1000 | X |
6941117 25000 | + | 31 1000 | X | = | 4 | X |
31 1000 | X | − | 4 | X | = | - | 6941117 25000 |
| - | 3969 1000 | X | = | - | 6941117 25000 |
6941117 25000 | = | 3969 1000 | X |
3969 1000 | X | = | 6941117 25000 |
| X | = | 6941117 25000 | ÷ | 3969 1000 |
| = | 6941117 25000 | × | 1000 3969 |
| = | 6941117 25 | × | 1 3969 |
| X | = | 6941117 99225 |
| X | = | 69.953308 |