| ( | 155 | + | 779 2 | ) | ÷ | 31 | × | x | + | 333 2 | ÷ | 31 | × | ( | x | + | 15 | ) | + | 93 | ÷ | 31 | × | ( | x | + | 30 | ) | = | 2108 |
| 方程左边 = | ( | 155 | + | 779 2 | ) | × | 1 31 | x | + | 333 62 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| ( | 155 | + | 779 2 | ) | × | 1 31 | x | + | 333 62 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) | = | 2108 |
| 方程左边 = | 155 | × | 1 31 | x | + | 779 2 | × | 1 31 | x | + | 333 62 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| = | 5 | x | + | 779 62 | x | + | 333 62 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| = | 1089 62 | x | + | 333 62 | ( | x | + | 15 | ) | + | 3 | ( | x | + | 30 | ) |
| = | 1089 62 | x | + | 333 62 | x | + | 333 62 | × | 15 | + | 3 | ( | x | + | 30 | ) |
| = | 1089 62 | x | + | 333 62 | x | + | 4995 62 | + | 3 | ( | x | + | 30 | ) |
| = | 711 31 | x | + | 4995 62 | + | 3 | ( | x | + | 30 | ) |
| = | 711 31 | x | + | 4995 62 | + | 3 | x | + | 3 | × | 30 |
| = | 711 31 | x | + | 4995 62 | + | 3 | x | + | 90 |
| = | 804 31 | x | + | 10575 62 |
804 31 | x | + | 10575 62 | = | 2108 |
804 31 | x | = | 2108 | − | 10575 62 |
804 31 | x | = | 120121 62 |
| x | = | 120121 62 | ÷ | 804 31 |
| = | 120121 62 | × | 31 804 |
| = | 120121 2 | × | 1 804 |
| x | = | 120121 1608 |
| x | = | 74.702114 |