1209 100 | x | = | 399 50 | ( | 7 2 | + | x | ) |
| 方程右边 = | 399 50 | × | 7 2 | + | 399 50 | x |
| = | 2793 100 | + | 399 50 | x |
1209 100 | x | = | 2793 100 | + | 399 50 | x |
1209 100 | x | − | 399 50 | x | = | 2793 100 |
411 100 | x | = | 2793 100 |
| x | = | 2793 100 | ÷ | 411 100 |
| = | 2793 100 | × | 100 411 |
| = | 931 | × | 1 137 |
| x | = | 931 137 |
| x | = | 6.79562 |