| x | × | 49 5 | × | 28 5 | + | 13600 | × | 49 5 | × | 1 5 | = | - | 980 | + | 1000 | × | 49 5 | × | 73 10 |
| 方程左边 = | x | × | 1372 25 | + | 26656 |
1372 25 | x | + | 26656 | = | - | 980 | + | 1000 | × | 49 5 | × | 73 10 |
| 方程右边 = | - | 980 | + | 71540 |
| = | 70560 |
1372 25 | x | + | 26656 | = | 70560 |
1372 25 | x | = | 70560 | − | 26656 |
1372 25 | x | = | 43904 |
| x | = | 43904 | ÷ | 1372 25 |
| = | 43904 | × | 25 1372 |
| = | 32 | × | 25 |
| x | = | 800 |