| ( | ( | 9 20 | ÷ | x | + | 9 2 | ) | + | ( | 1 | ÷ | 10 | ) | ) | × | 3 10 | = | x |
| ( | 9 20 | ÷ | x | + | 9 2 | ) | × | 3 10 | + | ( | 1 | ÷ | 10 | ) | × | 3 10 | = | x |
9 20 | ÷ | x | × | 3 10 | + | 9 2 | × | 3 10 | + | ( | 1 | ÷ | 10 | ) | × | 3 10 | = | x |
27 200 | ÷ | x | + | 27 20 | + | ( | 1 | ÷ | 10 | ) | × | 3 10 | = | x |
| 方程两边同时乘以: | x |
27 200 | + | 27 20 | x | + | ( | 1 | ÷ | 10 | ) | × | 3 10 | x | = | x | x |
27 200 | + | 27 20 | x | + | 1 | ÷ | 10 | × | 3 10 | x | = | x | x |
27 200 | + | 27 20 | x | + | 3 100 | x | = | x | x |
27 200 | + | 69 50 | x | = | x | x |