| ( | 21 20 | − | 3 10000 | ) | x | + | ( | 19 20 | − | 3 10000 | ) | ( | 1 | − | x | ) | = | 1 |
| 方程左边 = | 21 20 | x | − | 3 10000 | x | + | ( | 19 20 | − | 3 10000 | ) | ( | 1 | − | x | ) |
| = | 10497 10000 | x | + | ( | 19 20 | − | 3 10000 | ) | ( | 1 | − | x | ) |
| = | 10497 10000 | x | + | 19 20 | ( | 1 | − | x | ) | − | 3 10000 | ( | 1 | − | x | ) |
| = | 10497 10000 | x | + | 19 20 | × | 1 | − | 19 20 | x | − | 3 10000 | ( | 1 | − | x | ) |
| = | 10497 10000 | x | + | 19 20 | − | 19 20 | x | − | 3 10000 | ( | 1 | − | x | ) |
| = | 997 10000 | x | + | 19 20 | − | 3 10000 | ( | 1 | − | x | ) |
| = | 997 10000 | x | + | 19 20 | − | 3 10000 | × | 1 | + | 3 10000 | x |
| = | 997 10000 | x | + | 19 20 | − | 3 10000 | + | 3 10000 | x |
| = | 1 10 | x | + | 9497 10000 |
1 10 | x | + | 9497 10000 | = | 1 |
1 10 | x | = | 1 | − | 9497 10000 |
1 10 | x | = | 503 10000 |
| x | = | 503 10000 | ÷ | 1 10 |
| = | 503 10000 | × | 10 |
| = | 503 1000 | × | 1 |
| x | = | 503 1000 |
| x | = | 0.503 |