399 200 | ÷ | ( | 199 | − | 200 | x | ) | + | 599 200 | = | 7 2 |
| 方程两边同时乘以: | ( | 199 | − | 200 | x | ) |
399 200 | + | 599 200 | ( | 199 | − | 200 | x | ) | = | 7 2 | ( | 199 | − | 200 | x | ) |
399 200 | + | 599 200 | × | 199 | − | 599 200 | × | 200 | x | = | 7 2 | ( | 199 | − | 200 | x | ) |
399 200 | + | 599 200 | × | 199 | − | 599 200 | × | 200 | x | = | 7 2 | × | 199 | − | 7 2 | × | 200 | x |
399 200 | + | 119201 200 | − | 599 | x | = | 1393 2 | − | 700 | x |
| 598 | − | 599 | x | = | 1393 2 | − | 700 | x |
| - | 599 | x | + | 700 | x | = | 1393 2 | − | 598 |
| 101 | x | = | 1393 2 | − | 598 |
| 101 | x | = | 197 2 |
| x | = | 197 2 | ÷ | 101 |
| = | 197 2 | × | 1 101 |
| x | = | 197 202 |
| x | = | 0.975248 |