| ( | 5 | ( | 48 | + | x | ) | + | ( | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | ) | ) | ÷ | ( | 50 | + | x | ) | = | 5 |
| 方程两边同时乘以: | ( | 50 | + | x | ) |
| ( | 5 | ( | 48 | + | x | ) | + | ( | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | ) | ) | = | 5 | ( | 50 | + | x | ) |
| 5 | ( | 48 | + | x | ) | + | ( | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | ) | = | 5 | ( | 50 | + | x | ) |
| 5 | ( | 48 | + | x | ) | + | ( | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | ) | = | 5 | × | 50 | + | 5 | x |
| 5 | ( | 48 | + | x | ) | + | ( | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | ) | = | 250 | + | 5 | x |
| 5 | × | 48 | + | 5 | x | + | ( | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | ) | = | 250 | + | 5 | x |
| 240 | + | 5 | x | + | ( | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | ) | = | 250 | + | 5 | x |
| 240 | + | 5 | x | + | 4 | × | 0 | + | 3 | × | 0 | + | 2 | × | 1 | + | 1 | × | 1 | = | 250 | + | 5 | x |
| 240 | + | 5 | x | + | 0 | + | 0 | + | 2 | + | 1 | = | 250 | + | 5 | x |
| 243 | + | 5 | x | = | 250 | + | 5 | x |
| 5 | x | − | 5 | x | = | 250 | − | 243 |
| 0 | x | = | 250 | − | 243 |
| 0 | x | = | 7 |