| ( | x | − | 100 | ) | ÷ | ( | 100 | ÷ | 15 | + | 100 | × | 3 5000 | + | x | × | 3 5000 | ) | = | 30 |
| 方程两边同时乘以: | ( | 100 | ÷ | 15 | + | 100 | × | 3 5000 | + | x | × | 3 5000 | ) |
| ( | x | − | 100 | ) | = | 30 | ( | 100 | ÷ | 15 | + | 100 | × | 3 5000 | + | x | × | 3 5000 | ) |
| x | − | 100 | = | 30 | ( | 100 | ÷ | 15 | + | 100 | × | 3 5000 | + | x | × | 3 5000 | ) |
| x | − | 100 | = | 30 | × | 100 | ÷ | 15 | + | 30 | × | 100 | × | 3 5000 | + | 30 | x | × | 3 5000 |
| x | − | 100 | = | 200 | + | 9 5 | + | 9 500 | x |
| x | − | 100 | = | 1009 5 | + | 9 500 | x |
| x | − | 9 500 | x | = | 1009 5 | + | 100 |
491 500 | x | = | 1009 5 | + | 100 |
491 500 | x | = | 1509 5 |
| x | = | 1509 5 | ÷ | 491 500 |
| = | 1509 5 | × | 500 491 |
| = | 1509 | × | 100 491 |
| x | = | 150900 491 |
| x | = | 307.331976 |