133 10 | X | + | ( | 4 | − | X | ) | × | 407 5 | = | 65 | X | × | 4 |
| 方程左边 = | 133 10 | X | + | 4 | × | 407 5 | − | X | × | 407 5 |
| = | 133 10 | X | + | 1628 5 | − | X | × | 407 5 |
| = | - | 681 10 | X | + | 1628 5 |
| - | 681 10 | X | + | 1628 5 | = | 65 | X | × | 4 |
| 方程右边 = | 260 | X |
| - | 681 10 | X | + | 1628 5 | = | 260 | X |
| - | 681 10 | X | − | 260 | X | = | - | 1628 5 |
| - | 3281 10 | X | = | - | 1628 5 |
1628 5 | = | 3281 10 | X |
3281 10 | X | = | 1628 5 |
| X | = | 1628 5 | ÷ | 3281 10 |
| = | 1628 5 | × | 10 3281 |
| = | 1628 | × | 2 3281 |
| X | = | 3256 3281 |
| X | = | 0.99238 |