| ( | 810 | × | 541 1000 | + | x | ) | ÷ | ( | 810 | + | x | ) | = | 3 5 |
| 方程两边同时乘以: | ( | 810 | + | x | ) |
| ( | 810 | × | 541 1000 | + | x | ) | = | 3 5 | ( | 810 | + | x | ) |
| 810 | × | 541 1000 | + | x | = | 3 5 | ( | 810 | + | x | ) |
| 810 | × | 541 1000 | + | x | = | 3 5 | × | 810 | + | 3 5 | x |
43821 100 | + | x | = | 486 | + | 3 5 | x |
| x | − | 3 5 | x | = | 486 | − | 43821 100 |
2 5 | x | = | 486 | − | 43821 100 |
2 5 | x | = | 4779 100 |
| x | = | 4779 100 | ÷ | 2 5 |
| = | 4779 100 | × | 5 2 |
| = | 4779 20 | × | 1 2 |
| x | = | 4779 40 |
| x | = | 119.475 |