787 2 | x | + | 1209 5 | ( | 1 5 | − | x | ) | = | 6353 100 |
| 方程左边 = | 787 2 | x | + | 1209 5 | × | 1 5 | − | 1209 5 | x |
| = | 787 2 | x | + | 1209 25 | − | 1209 5 | x |
| = | 1517 10 | x | + | 1209 25 |
1517 10 | x | + | 1209 25 | = | 6353 100 |
1517 10 | x | = | 6353 100 | − | 1209 25 |
1517 10 | x | = | 1517 100 |
| x | = | 1517 100 | ÷ | 1517 10 |
| = | 1517 100 | × | 10 1517 |
| = | 1 10 | × | 1 |
| x | = | 1 10 |
| x | = | 0.1 |