| ( | 111 100 | + | x | ) | ÷ | ( | 77 20 | + | x | ) | = | 30 100 |
| 方程两边同时乘以: | ( | 77 20 | + | x | ) |
| ( | 111 100 | + | x | ) | = | 30 100 | ( | 77 20 | + | x | ) |
111 100 | + | x | = | 30 100 | ( | 77 20 | + | x | ) |
111 100 | + | x | = | 30 100 | × | 77 20 | + | 30 100 | x |
111 100 | + | x | = | 231 200 | + | 30 100 | x |
| x | − | 30 100 | x | = | 231 200 | − | 111 100 |
7 10 | x | = | 231 200 | − | 111 100 |
7 10 | x | = | 9 200 |
| x | = | 9 200 | ÷ | 7 10 |
| = | 9 200 | × | 10 7 |
| = | 9 20 | × | 1 7 |
| x | = | 9 140 |
| x | = | 0.064286 |