| 280 | + | 60 | + | ( | 23 | × | 2 | X | × | 4 5 | ) | × | 1 | = | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 |
| 方程左边 = | 340 | + | ( | 23 | × | 2 | X | × | 4 5 | ) | × | 1 |
| 340 | + | ( | 23 | × | 2 | X | × | 4 5 | ) | × | 1 | = | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 |
| 方程左边 = | 340 | + | 23 | × | 2 | X | × | 4 5 | × | 1 |
| = | 340 | + | 184 5 | X |
| 340 | + | 184 5 | X | = | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 |
| 方程右边 = | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) |
| 340 | + | 184 5 | X | = | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) |
| 方程右边 = | 10 | × | 7 | ( | 11 2 | − | 1 2 | ) | + | 10 | × | 2 | X | ( | 11 2 | − | 1 2 | ) |
| = | 70 | ( | 11 2 | − | 1 2 | ) | + | 20 | X | ( | 11 2 | − | 1 2 | ) |
| = | 70 | × | 11 2 | − | 70 | × | 1 2 | + | 20 | X | ( | 11 2 | − | 1 2 | ) |
| = | 385 | − | 35 | + | 20 | X | ( | 11 2 | − | 1 2 | ) |
| = | 350 | + | 20 | X | ( | 11 2 | − | 1 2 | ) |
| = | 350 | + | 20 | X | × | 11 2 | − | 20 | X | × | 1 2 |
| = | 350 | + | 110 | X | − | 10 | X |
| = | 350 | + | 100 | X |
| 340 | + | 184 5 | X | = | 350 | + | 100 | X |
184 5 | X | − | 100 | X | = | 350 | − | 340 |
| - | 316 5 | X | = | 350 | − | 340 |
| - | 316 5 | X | = | 10 |
| - | 10 | = | 316 5 | X |
316 5 | X | = | - | 10 |
| X | = | - | 10 | ÷ | 316 5 |
| = | - | 10 | × | 5 316 |
| = | - | 5 | × | 5 158 |
| X | = | - | 25 158 |
| X | = | - 0.158228 |