| ( | 630 | + | 630 | + | X | ) | ÷ | 2 | × | 2300 | = | 1630 |
| 方程左边 = | ( | 630 | + | 630 | + | X | ) | × | 1150 |
| ( | 630 | + | 630 | + | X | ) | × | 1150 | = | 1630 |
| 方程左边 = | 630 | × | 1150 | + | 630 | × | 1150 | + | X | × | 1150 |
| = | 724500 | + | 724500 | + | X | × | 1150 |
| = | 1449000 | + | 1150 | X |
| 1449000 | + | 1150 | X | = | 1630 |
| 1150 | X | = | 1630 | − | 1449000 |
| 1150 | X | = | - | 1447370 |
| X | = | - | 1447370 | ÷ | 1150 |
| = | - | 1447370 | × | 1 1150 |
| = | - | 144737 | × | 1 115 |
| X | = | - | 144737 115 |
| X | = | - 1258.582609 |