| ( | 5 | × | 54 | + | 1 | × | 5 | ) | ÷ | ( | 90 | + | x | ) | = | 47 10 |
| 方程两边同时乘以: | ( | 90 | + | x | ) |
| ( | 5 | × | 54 | + | 1 | × | 5 | ) | = | 47 10 | ( | 90 | + | x | ) |
| 5 | × | 54 | + | 1 | × | 5 | = | 47 10 | ( | 90 | + | x | ) |
| 5 | × | 54 | + | 1 | × | 5 | = | 47 10 | × | 90 | + | 47 10 | x |
| 270 | + | 5 | = | 423 | + | 47 10 | x |
| 275 | = | 423 | + | 47 10 | x |
| - | 47 10 | x | = | 423 | − | 275 |
| - | 47 10 | x | = | 148 |
| - | 148 | = | 47 10 | x |
47 10 | x | = | - | 148 |
| x | = | - | 148 | ÷ | 47 10 |
| = | - | 148 | × | 10 47 |
| x | = | - | 1480 47 |
| x | = | - 31.489362 |