| 280 | + | 60 | + | ( | 23 | × | 2 | X | × | 4 5 | ) | × | 1 | = | 10 | ( | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 | ) | × | 21 20 |
| 方程左边 = | 340 | + | ( | 23 | × | 2 | X | × | 4 5 | ) | × | 1 |
| 340 | + | ( | 23 | × | 2 | X | × | 4 5 | ) | × | 1 | = | 10 | ( | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 | ) | × | 21 20 |
| 方程左边 = | 340 | + | 23 | × | 2 | X | × | 4 5 | × | 1 |
| = | 340 | + | 184 5 | X |
| 340 | + | 184 5 | X | = | 10 | ( | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 | ) | × | 21 20 |
| 方程右边 = | 21 2 | ( | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 | ) |
| 340 | + | 184 5 | X | = | 21 2 | ( | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 | ) |
| 方程右边 = | 21 2 | × | 10 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) | × | 1 |
| = | 105 | ( | 7 | + | 2 | X | ) | ( | 11 2 | − | 1 2 | ) |
| = | 105 | × | 7 | ( | 11 2 | − | 1 2 | ) | + | 105 | × | 2 | X | ( | 11 2 | − | 1 2 | ) |
| = | 735 | ( | 11 2 | − | 1 2 | ) | + | 210 | X | ( | 11 2 | − | 1 2 | ) |
| = | 735 | × | 11 2 | − | 735 | × | 1 2 | + | 210 | X | ( | 11 2 | − | 1 2 | ) |
| = | 8085 2 | − | 735 2 | + | 210 | X | ( | 11 2 | − | 1 2 | ) |
| = | 3675 | + | 210 | X | ( | 11 2 | − | 1 2 | ) |
| = | 3675 | + | 210 | X | × | 11 2 | − | 210 | X | × | 1 2 |
| = | 3675 | + | 1155 | X | − | 105 | X |
| = | 3675 | + | 1050 | X |
| 340 | + | 184 5 | X | = | 3675 | + | 1050 | X |
184 5 | X | − | 1050 | X | = | 3675 | − | 340 |
| - | 5066 5 | X | = | 3675 | − | 340 |
| - | 5066 5 | X | = | 3335 |
| - | 3335 | = | 5066 5 | X |
5066 5 | X | = | - | 3335 |
| X | = | - | 3335 | ÷ | 5066 5 |
| = | - | 3335 | × | 5 5066 |
| X | = | - | 16675 5066 |
| X | = | - 3.291552 |