| x | ÷ | ( | 385 | − | x | − | 903 50 | ) | = | 3 10 |
| 方程两边同时乘以: | ( | 385 | − | x | − | 903 50 | ) |
| x | = | 3 10 | ( | 385 | − | x | − | 903 50 | ) |
| x | = | 3 10 | × | 385 | − | 3 10 | x | − | 3 10 | × | 903 50 |
| x | = | 231 2 | − | 3 10 | x | − | 2709 500 |
| x | = | 55041 500 | − | 3 10 | x |
| x | + | 3 10 | x | = | 55041 500 |
13 10 | x | = | 55041 500 |
| x | = | 55041 500 | ÷ | 13 10 |
| = | 55041 500 | × | 10 13 |
| = | 55041 50 | × | 1 13 |
| x | = | 55041 650 |
| x | = | 84.678462 |