| 1 | − | ( | 79 10 | − | x | ) | ÷ | ( | 139 5 | − | 4951 500 | ) | = | 2611 10000 |
| 方程两边同时乘以: | ( | 139 5 | − | 4951 500 | ) |
| 1 | ( | 139 5 | − | 4951 500 | ) | − | ( | 79 10 | − | x | ) | = | 2611 10000 | ( | 139 5 | − | 4951 500 | ) |
| 1 | × | 139 5 | − | 1 | × | 4951 500 | − | ( | 79 10 | − | x | ) | = | 2611 10000 | ( | 139 5 | − | 4951 500 | ) |
| 1 | × | 139 5 | − | 1 | × | 4951 500 | − | ( | 79 10 | − | x | ) | = | 2611 10000 | × | 139 5 | − | 2611 10000 | × | 4951 500 |
139 5 | − | 4951 500 | − | ( | 79 10 | − | x | ) | = | 362929 50000 | − | 12927061 5000000 |