| ( | ( | x | − | 168 | ) | × | 3 4 | ) | ÷ | 400 | = | ( | ( | x | − | 48 | ) | × | 3 4 | − | 50 | ) | ÷ | ( | 440 | ) |
| 方程两边同时乘以: | ( | 440 | ) |
| ( | ( | x | − | 168 | ) | × | 3 4 | ) | ÷ | 400 | × | ( | 440 | ) | = | ( | ( | x | − | 48 | ) | × | 3 4 | − | 50 | ) |
| ( | x | − | 168 | ) | × | 3 4 | ÷ | 400 | × | ( | 440 | ) | = | ( | ( | x | − | 48 | ) | × | 3 4 | − | 50 | ) |
| ( | x | − | 168 | ) | × | 3 4 | ÷ | 400 | × | ( | 440 | ) | = | ( | x | − | 48 | ) | × | 3 4 | − | 50 |
| ( | x | − | 168 | ) | × | 3 1600 | ( | 440 | ) | = | ( | x | − | 48 | ) | × | 3 4 | − | 50 |
| x | × | 3 1600 | ( | 440 | ) | − | 168 | × | 3 1600 | ( | 440 | ) | = | ( | x | − | 48 | ) | × | 3 4 | − | 50 |
| x | × | 3 1600 | ( | 440 | ) | − | 168 | × | 3 1600 | ( | 440 | ) | = | x | × | 3 4 | − | 48 | × | 3 4 | − | 50 |
| x | × | 3 1600 | ( | 440 | ) | − | 63 200 | ( | 440 | ) | = | x | × | 3 4 | − | 36 | − | 50 |
| x | × | 3 1600 | ( | 440 | ) | − | 63 200 | ( | 440 | ) | = | 3 4 | x | − | 86 |
| x | × | 3 1600 | × | 440 | − | 63 200 | ( | 440 | ) | = | 3 4 | x | − | 86 |
| x | × | 33 40 | − | 63 200 | ( | 440 | ) | = | 3 4 | x | − | 86 |
33 40 | x | − | 63 200 | × | 440 | = | 3 4 | x | − | 86 |
33 40 | x | − | 693 5 | = | 3 4 | x | − | 86 |
33 40 | x | − | 3 4 | x | = | - | 86 | + | 693 5 |
3 40 | x | = | - | 86 | + | 693 5 |
3 40 | x | = | 263 5 |
| x | = | 263 5 | ÷ | 3 40 |
| = | 263 5 | × | 40 3 |
| = | 263 | × | 8 3 |
| x | = | 2104 3 |
| x | = | 701.333333 |