17 50 | ( | ( | 2000 | − | X | ) | × | 21 100 | + | 79 100 | ( | - | 600 | − | X | ) | ) | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) | = | 1220 |
| 方程左边 = | 17 50 | ( | 2000 | − | X | ) | × | 21 100 | + | 17 50 | × | 79 100 | ( | - | 600 | − | X | ) | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) |
| = | 357 5000 | ( | 2000 | − | X | ) | + | 1343 5000 | ( | - | 600 | − | X | ) | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) |
| = | 357 5000 | × | 2000 | − | 357 5000 | X | + | 1343 5000 | ( | - | 600 | − | X | ) | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) |
| = | 714 5 | − | 357 5000 | X | + | 1343 5000 | ( | - | 600 | − | X | ) | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) |
| = | 714 5 | − | 357 5000 | X | − | 1343 5000 | × | 600 | − | 1343 5000 | X | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) |
| = | 714 5 | − | 357 5000 | X | − | 4029 25 | − | 1343 5000 | X | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) |
| = | - | 459 25 | − | 17 50 | X | + | 33 50 | ( | ( | 2000 | − | X | ) | × | 19 20 | + | 1 20 | ( | - | 600 | − | X | ) | ) |
| = | - | 459 25 | − | 17 50 | X | + | 33 50 | ( | 2000 | − | X | ) | × | 19 20 | + | 33 50 | × | 1 20 | ( | - | 600 | − | X | ) |
| = | - | 459 25 | − | 17 50 | X | + | 627 1000 | ( | 2000 | − | X | ) | + | 33 1000 | ( | - | 600 | − | X | ) |
| = | - | 459 25 | − | 17 50 | X | + | 627 1000 | × | 2000 | − | 627 1000 | X | + | 33 1000 | ( | - | 600 | − | X | ) |
| = | - | 459 25 | − | 17 50 | X | + | 1254 | − | 627 1000 | X | + | 33 1000 | ( | - | 600 | − | X | ) |
| = | 30891 25 | − | 967 1000 | X | + | 33 1000 | ( | - | 600 | − | X | ) |
| = | 30891 25 | − | 967 1000 | X | − | 33 1000 | × | 600 | − | 33 1000 | X |
| = | 30891 25 | − | 967 1000 | X | − | 99 5 | − | 33 1000 | X |
| = | 30396 25 | − | 1 | X |
30396 25 | − | 1 | X | = | 1220 |
| - | 1 | X | = | 1220 | − | 30396 25 |
| - | X | = | 1220 | − | 30396 25 |
| - | X | = | 104 25 |
| - | 104 25 | = | X |
| X | = | - | 104 25 |