127 250 | ( | 50 | + | 13 2 | X | ) | = | 123 250 | ( | 40 | + | 17 2 | X | ) |
| 方程左边 = | 127 250 | × | 50 | + | 127 250 | × | 13 2 | X |
| = | 127 5 | + | 1651 500 | X |
127 5 | + | 1651 500 | X | = | 123 250 | ( | 40 | + | 17 2 | X | ) |
| 方程右边 = | 123 250 | × | 40 | + | 123 250 | × | 17 2 | X |
| = | 492 25 | + | 2091 500 | X |
127 5 | + | 1651 500 | X | = | 492 25 | + | 2091 500 | X |
1651 500 | X | − | 2091 500 | X | = | 492 25 | − | 127 5 |
| - | 22 25 | X | = | 492 25 | − | 127 5 |
| - | 22 25 | X | = | - | 143 25 |
143 25 | = | 22 25 | X |
22 25 | X | = | 143 25 |
| X | = | 143 25 | ÷ | 22 25 |
| = | 143 25 | × | 25 22 |
| = | 13 | × | 1 2 |
| X | = | 13 2 |
| X | = | 6.5 |