| ( | 6 100 | − | X | ) | ÷ | ( | 8 100 | − | 6 100 | ) | = | ( | 73601 10000 | − | 7 | ) | ÷ | ( | 67101 10000 | − | 73601 10000 | ) |
| 方程两边同时乘以: | ( | 8 100 | − | 6 100 | ) | , | ( | 67101 10000 | − | 73601 10000 | ) |
| ( | 6 100 | − | X | ) | ( | 67101 10000 | − | 73601 10000 | ) | = | ( | 73601 10000 | − | 7 | ) | ( | 8 100 | − | 6 100 | ) |
6 100 | ( | 67101 10000 | − | 73601 10000 | ) | − | X | ( | 67101 10000 | − | 73601 10000 | ) | = | ( | 73601 10000 | − | 7 | ) | ( | 8 100 | − | 6 100 | ) |
6 100 | ( | 67101 10000 | − | 73601 10000 | ) | − | X | ( | 67101 10000 | − | 73601 10000 | ) | = | 73601 10000 | ( | 8 100 | − | 6 100 | ) | − | 7 | ( | 8 100 | − | 6 100 | ) |
6 100 | × | 67101 10000 | − | 6 100 | × | 73601 10000 | − | X | ( | 67101 10000 | − | 73601 10000 | ) | = | 73601 10000 | ( | 8 100 | − | 6 100 | ) | − | 7 | ( | 8 100 | − | 6 100 | ) |
6 100 | × | 67101 10000 | − | 6 100 | × | 73601 10000 | − | X | ( | 67101 10000 | − | 73601 10000 | ) | = | 73601 10000 | × | 8 100 | − | 73601 10000 | × | 6 100 | − | 7 | ( | 8 100 | − | 6 100 | ) |
201303 500000 | − | 220803 500000 | − | X | ( | 67101 10000 | − | 73601 10000 | ) | = | 73601 125000 | − | 220803 500000 | − | 7 | ( | 8 100 | − | 6 100 | ) |
| X= | 1777 25000 |