| 12 | ÷ | 103 | + | 20 | ÷ | 200 | + | X | ÷ | 1000 | + | ( | 131 2 | − | X | ) | × | 1650 | = | 3 10 |
| 方程左边 = | 12 103 | + | 1 10 | + | X | × | 1 1000 | + | ( | 131 2 | − | X | ) | × | 1650 |
| = | 223 1030 | + | 1 1000 | X | + | ( | 131 2 | − | X | ) | × | 1650 |
223 1030 | + | 1 1000 | X | + | ( | 131 2 | − | X | ) | × | 1650 | = | 3 10 |
| 方程左边 = | 223 1030 | + | 1 1000 | X | + | 131 2 | × | 1650 | − | X | × | 1650 |
| = | 223 1030 | + | 1 1000 | X | + | 108075 | − | X | × | 1650 |
| = | 111317473 1030 | − | 1649999 1000 | X |
111317473 1030 | − | 1649999 1000 | X | = | 3 10 |
| - | 1649999 1000 | X | = | 3 10 | − | 111317473 1030 |
| - | 1649999 1000 | X | = | - | 55658582 515 |
55658582 515 | = | 1649999 1000 | X |
1649999 1000 | X | = | 55658582 515 |
| X | = | 55658582 515 | ÷ | 1649999 1000 |
| = | 55658582 515 | × | 1000 1649999 |
| = | 55658582 103 | × | 200 1649999 |
| X | = | 11131716400 169949897 |