| ( | 1193 400 | + | 3 4000 | x | ) | ( | 1310 | − | x | ) | = | ( | 63 40 | + | 3 4000 | x | ) | ( | x | − | 100 | ) |
| 方程左边 = | 1193 400 | ( | 1310 | − | x | ) | + | 3 4000 | x | ( | 1310 | − | x | ) |
| = | 1193 400 | × | 1310 | − | 1193 400 | x | + | 3 4000 | x | ( | 1310 | − | x | ) |
| = | 156283 40 | − | 1193 400 | x | + | 3 4000 | x | ( | 1310 | − | x | ) |
| = | 156283 40 | − | 1193 400 | x | + | 3 4000 | x | × | 1310 | − | 3 4000 | x | x |
| = | 156283 40 | − | 1193 400 | x | + | 393 400 | x | − | 3 4000 | x | x |
| = | 156283 40 | − | 2 | x | − | 3 4000 | x | x |
156283 40 | − | 2 | x | − | 3 4000 | x | x | = | ( | 63 40 | + | 3 4000 | x | ) | ( | x | − | 100 | ) |
| 方程右边 = | 63 40 | ( | x | − | 100 | ) | + | 3 4000 | x | ( | x | − | 100 | ) |
| = | 63 40 | x | − | 63 40 | × | 100 | + | 3 4000 | x | ( | x | − | 100 | ) |
| = | 63 40 | x | − | 315 2 | + | 3 4000 | x | ( | x | − | 100 | ) |
| = | 63 40 | x | − | 315 2 | + | 3 4000 | x | x | − | 3 4000 | x | × | 100 |
| = | 63 40 | x | − | 315 2 | + | 3 4000 | x | x | − | 3 40 | x |
| = | 3 2 | x | − | 315 2 | + | 3 4000 | x | x |
156283 40 | − | 2 | x | − | 3 4000 | x | x | = | 3 2 | x | − | 315 2 | + | 3 4000 | x | x |