| ( | 217 2 | + | 603 2 | ) | ÷ | 28 | × | x | + | 196 | ÷ | 28 | × | ( | 15 | + | x | ) | + | 85 | ÷ | 28 | × | ( | 30 | + | x | ) | = | 1251 |
| 方程左边 = | ( | 217 2 | + | 603 2 | ) | × | 1 28 | x | + | 7 | ( | 15 | + | x | ) | + | 85 28 | ( | 30 | + | x | ) |
| ( | 217 2 | + | 603 2 | ) | × | 1 28 | x | + | 7 | ( | 15 | + | x | ) | + | 85 28 | ( | 30 | + | x | ) | = | 1251 |
| 方程左边 = | 217 2 | × | 1 28 | x | + | 603 2 | × | 1 28 | x | + | 7 | ( | 15 | + | x | ) | + | 85 28 | ( | 30 | + | x | ) |
| = | 31 8 | x | + | 603 56 | x | + | 7 | ( | 15 | + | x | ) | + | 85 28 | ( | 30 | + | x | ) |
| = | 205 14 | x | + | 7 | ( | 15 | + | x | ) | + | 85 28 | ( | 30 | + | x | ) |
| = | 205 14 | x | + | 7 | × | 15 | + | 7 | x | + | 85 28 | ( | 30 | + | x | ) |
| = | 205 14 | x | + | 105 | + | 7 | x | + | 85 28 | ( | 30 | + | x | ) |
| = | 303 14 | x | + | 105 | + | 85 28 | ( | 30 | + | x | ) |
| = | 303 14 | x | + | 105 | + | 85 28 | × | 30 | + | 85 28 | x |
| = | 303 14 | x | + | 105 | + | 1275 14 | + | 85 28 | x |
| = | 691 28 | x | + | 2745 14 |
691 28 | x | + | 2745 14 | = | 1251 |
691 28 | x | = | 1251 | − | 2745 14 |
691 28 | x | = | 14769 14 |
| x | = | 14769 14 | ÷ | 691 28 |
| = | 14769 14 | × | 28 691 |
| = | 14769 | × | 2 691 |
| x | = | 29538 691 |
| x | = | 42.746744 |