| ( | 78 | − | 753 10 | ) | ÷ | ( | 3 10 | − | 2 5 | ) | = | ( | 78 | − | x | ) | ÷ | ( | 3 10 | − | 2727 10000 | ) |
| 方程两边同时乘以: | ( | 3 10 | − | 2 5 | ) | , | ( | 3 10 | − | 2727 10000 | ) |
| ( | 78 | − | 753 10 | ) | ( | 3 10 | − | 2727 10000 | ) | = | ( | 78 | − | x | ) | ( | 3 10 | − | 2 5 | ) |
| 78 | ( | 3 10 | − | 2727 10000 | ) | − | 753 10 | ( | 3 10 | − | 2727 10000 | ) | = | ( | 78 | − | x | ) | ( | 3 10 | − | 2 5 | ) |
| 78 | ( | 3 10 | − | 2727 10000 | ) | − | 753 10 | ( | 3 10 | − | 2727 10000 | ) | = | 78 | ( | 3 10 | − | 2 5 | ) | − | x | ( | 3 10 | − | 2 5 | ) |
| 78 | × | 3 10 | − | 78 | × | 2727 10000 | − | 753 10 | ( | 3 10 | − | 2727 10000 | ) | = | 78 | ( | 3 10 | − | 2 5 | ) | − | x | ( | 3 10 | − | 2 5 | ) |
| 78 | × | 3 10 | − | 78 | × | 2727 10000 | − | 753 10 | ( | 3 10 | − | 2727 10000 | ) | = | 78 | × | 3 10 | − | 78 | × | 2 5 | − | x | ( | 3 10 | − | 2 5 | ) |
117 5 | − | 106353 5000 | − | 753 10 | ( | 3 10 | − | 2727 10000 | ) | = | 117 5 | − | 156 5 | − | x | ( | 3 10 | − | 2 5 | ) |
10647 5000 | − | 753 10 | ( | 3 10 | − | 2727 10000 | ) | = | - | 39 5 | − | x | ( | 3 10 | − | 2 5 | ) |
10647 5000 | − | 753 10 | × | 3 10 | + | 753 10 | × | 2727 10000 | = | - | 39 5 | − | x | ( | 3 10 | − | 2 5 | ) |
10647 5000 | − | 753 10 | × | 3 10 | + | 753 10 | × | 2727 10000 | = | - | 39 5 | − | x | × | 3 10 | + | x | × | 2 5 |
10647 5000 | − | 2259 100 | + | 2053431 100000 | = | - | 39 5 | − | x | × | 3 10 | + | x | × | 2 5 |
7371 100000 | = | - | 39 5 | + | 1 10 | x |
| - | 1 10 | x | = | - | 39 5 | − | 7371 100000 |
| - | 1 10 | x | = | - | 787371 100000 |
787371 100000 | = | 1 10 | x |
1 10 | x | = | 787371 100000 |
| x | = | 787371 100000 | ÷ | 1 10 |
| = | 787371 100000 | × | 10 |
| = | 787371 10000 | × | 1 |
| x | = | 787371 10000 |
| x | = | 78.7371 |