| ( | 149 | + | 217 | ) | ÷ | 31 | × | x | + | 279 | ÷ | 31 | × | ( | x | + | 15 | ) | + | 124 | ÷ | 31 | × | ( | x | + | 30 | ) | = | 1549 |
| 方程左边 = | ( | 149 | + | 217 | ) | × | 1 31 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| ( | 149 | + | 217 | ) | × | 1 31 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) | = | 1549 |
| 方程左边 = | 149 | × | 1 31 | x | + | 217 | × | 1 31 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| = | 149 31 | x | + | 7 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| = | 366 31 | x | + | 9 | ( | x | + | 15 | ) | + | 4 | ( | x | + | 30 | ) |
| = | 366 31 | x | + | 9 | x | + | 9 | × | 15 | + | 4 | ( | x | + | 30 | ) |
| = | 366 31 | x | + | 9 | x | + | 135 | + | 4 | ( | x | + | 30 | ) |
| = | 645 31 | x | + | 135 | + | 4 | ( | x | + | 30 | ) |
| = | 645 31 | x | + | 135 | + | 4 | x | + | 4 | × | 30 |
| = | 645 31 | x | + | 135 | + | 4 | x | + | 120 |
| = | 769 31 | x | + | 255 |
769 31 | x | + | 255 | = | 1549 |
769 31 | x | = | 1549 | − | 255 |
769 31 | x | = | 1294 |
| x | = | 1294 | ÷ | 769 31 |
| = | 1294 | × | 31 769 |
| x | = | 40114 769 |
| x | = | 52.163849 |