| x | × | 199 | + | ( | 260 | − | 199 | ) | × | 3 10 | x | + | ( | 30 | − | x | ) | × | 248 | + | ( | 260 | − | 248 | ) | × | 3 10 | ( | 30 | − | x | ) | = | 0 |
| 方程左边 = | 199 | x | + | 260 | × | 3 10 | x | − | 199 | × | 3 10 | x | + | ( | 30 | − | x | ) | × | 248 | + | ( | 260 | − | 248 | ) | × | 3 10 |
| = | 199 | x | + | 78 | x | − | 597 10 | x | + | ( | 30 | − | x | ) | × | 248 | + | ( | 260 | − | 248 | ) | × | 3 10 | ( | 30 | − | x | ) |
| = | 2173 10 | x | + | ( | 30 | − | x | ) | × | 248 | + | ( | 260 | − | 248 | ) | × | 3 10 | ( | 30 | − | x | ) |
| = | 2173 10 | x | + | 30 | × | 248 | − | x | × | 248 | + | ( | 260 | − | 248 | ) | × | 3 10 | ( | 30 | − | x | ) |
| = | 2173 10 | x | + | 7440 | − | x | × | 248 | + | ( | 260 | − | 248 | ) | × | 3 10 | ( | 30 | − | x | ) |
| = | - | 307 10 | x | + | 7440 | + | ( | 260 | − | 248 | ) | × | 3 10 | ( | 30 | − | x | ) |
| = | - | 307 10 | x | + | 7440 | + | 260 | × | 3 10 | ( | 30 | − | x | ) | − | 248 | × | 3 10 | ( | 30 | − | x | ) |
| = | - | 307 10 | x | + | 7440 | + | 78 | ( | 30 | − | x | ) | − | 372 5 | ( | 30 | − | x | ) |
| = | - | 307 10 | x | + | 7440 | + | 78 | × | 30 | − | 78 | x | − | 372 5 | ( | 30 | − | x | ) |
| = | - | 307 10 | x | + | 7440 | + | 2340 | − | 78 | x | − | 372 5 | ( | 30 | − | x | ) |
| = | - | 1087 10 | x | + | 9780 | − | 372 5 | ( | 30 | − | x | ) |
| = | - | 1087 10 | x | + | 9780 | − | 372 5 | × | 30 | + | 372 5 | x |
| = | - | 1087 10 | x | + | 9780 | − | 2232 | + | 372 5 | x |
| = | - | 343 10 | x | + | 7548 |
| - | 343 10 | x | + | 7548 | = | 0 |
| - | 343 10 | x | = | 0 | − | 7548 |
| - | 343 10 | x | = | - | 7548 |
| 7548 | = | 343 10 | x |
343 10 | x | = | 7548 |
| x | = | 7548 | ÷ | 343 10 |
| = | 7548 | × | 10 343 |
| x | = | 75480 343 |
| x | = | 220.058309 |