3 4 | ( | 1 | + | 30 100 | + | 18 100 | + | 18 100 | + | x | × | 4 100 | × | 2 | ) | × | 10 | = | 80 |
| 方程左边 = | 15 2 | ( | 1 | + | 30 100 | + | 18 100 | + | 18 100 | + | x | × | 4 100 | × | 2 | ) |
15 2 | ( | 1 | + | 30 100 | + | 18 100 | + | 18 100 | + | x | × | 4 100 | × | 2 | ) | = | 80 |
| 方程左边 = | 15 2 | × | 1 | + | 15 2 | × | 30 100 | + | 15 2 | × | 18 100 | + | 15 2 | × | 18 100 | + | 15 2 | x | × | 4 100 | × | 2 |
| = | 15 2 | + | 9 4 | + | 27 20 | + | 27 20 | + | 3 5 | x |
| = | 249 20 | + | 3 5 | x |
249 20 | + | 3 5 | x | = | 80 |
3 5 | x | = | 80 | − | 249 20 |
3 5 | x | = | 1351 20 |
| x | = | 1351 20 | ÷ | 3 5 |
| = | 1351 20 | × | 5 3 |
| = | 1351 4 | × | 1 3 |
| x | = | 1351 12 |
| x | = | 112.583333 |