7 2000 | x | + | ( | 4800 | − | x | ) | − | 3 500 | = | 124 5 |
| 方程左边 = | 7 2000 | x | + | 4800 | − | x | − | 3 500 |
| = | - | 1993 2000 | x | + | 2399997 500 |
| - | 1993 2000 | x | + | 2399997 500 | = | 124 5 |
| - | 1993 2000 | x | = | 124 5 | − | 2399997 500 |
| - | 1993 2000 | x | = | - | 2387597 500 |
2387597 500 | = | 1993 2000 | x |
1993 2000 | x | = | 2387597 500 |
| x | = | 2387597 500 | ÷ | 1993 2000 |
| = | 2387597 500 | × | 2000 1993 |
| = | 2387597 | × | 4 1993 |
| x | = | 9550388 1993 |
| x | = | 4791.965881 |