| ( | x | ÷ | 27 10 | ) | + | ( | ( | 456 | − | x | ) | ÷ | 89 10 | ) | = | 100 |
| 方程左边 = | x | ÷ | 27 10 | + | ( | ( | 456 | − | x | ) | ÷ | 89 10 | ) |
| = | 10 27 | x | + | ( | 456 | − | x | ) | ÷ | 89 10 |
| = | 10 27 | x | + | 456 | × | 10 89 | − | x | × | 10 89 |
| = | 10 27 | x | + | 4560 89 | − | x | × | 10 89 |
| = | 620 2403 | x | + | 4560 89 |
620 2403 | x | + | 4560 89 | = | 100 |
620 2403 | x | = | 100 | − | 4560 89 |
620 2403 | x | = | 4340 89 |
| x | = | 4340 89 | ÷ | 620 2403 |
| = | 4340 89 | × | 2403 620 |
| = | 7 | × | 27 |
| x | = | 189 |