| ( | X | − | 79 10000 | ) | ÷ | ( | 17 1250 | − | 79 10000 | ) | = | ( | 213 500 | − | 2 5 | ) | ÷ | 1 10 |
| 方程两边同时乘以: | ( | 17 1250 | − | 79 10000 | ) |
| ( | X | − | 79 10000 | ) | = | ( | 213 500 | − | 2 5 | ) | ÷ | 1 10 | × | ( | 17 1250 | − | 79 10000 | ) |
| X | − | 79 10000 | = | ( | 213 500 | − | 2 5 | ) | ÷ | 1 10 | × | ( | 17 1250 | − | 79 10000 | ) |
| X | − | 79 10000 | = | 213 500 | ÷ | 1 10 | × | ( | 17 1250 | − | 79 10000 | ) | − | 2 5 | ÷ | 1 10 | × | ( | 17 1250 | − | 79 10000 | ) |
| X | − | 79 10000 | = | 213 50 | ( | 17 1250 | − | 79 10000 | ) | − | 4 | ( | 17 1250 | − | 79 10000 | ) |
| X | − | 79 10000 | = | 213 50 | × | 17 1250 | − | 213 50 | × | 79 10000 | − | 4 | ( | 17 1250 | − | 79 10000 | ) |
| X | − | 79 10000 | = | 3621 62500 | − | 16827 500000 | − | 4 | ( | 17 1250 | − | 79 10000 | ) |
| X= | 4691 500000 |