| 100000 | ÷ | ( | 69 10 | − | x | ) | ÷ | 2 | − | 100000 | ÷ | 69 10 | ÷ | 2 | = | 1000 | − | 1375 2 |
| 方程两边同时乘以: | ( | 69 10 | − | x | ) |
| 100000 | ÷ | 2 | − | 100000 | ÷ | 69 10 | ÷ | 2 | × | ( | 69 10 | − | x | ) | = | 1000 | ( | 69 10 | − | x | ) | − | 1375 2 | ( | 69 10 | − | x | ) |
| 100000 | ÷ | 2 | − | 100000 | ÷ | 69 10 | ÷ | 2 | × | 69 10 | + | 100000 | ÷ | 69 10 | ÷ | 2 | × | x | = | 1000 | ( | 69 10 | − | x | ) | − | 1375 2 | ( | 69 10 | − | x | ) |
| 100000 | ÷ | 2 | − | 100000 | ÷ | 69 10 | ÷ | 2 | × | 69 10 | + | 100000 | ÷ | 69 10 | ÷ | 2 | × | x | = | 1000 | × | 69 10 | − | 1000 | x | − | 1375 2 | ( | 69 10 | − | x | ) |
| 50000 | − | 50000 | + | 500000 69 | x | = | 6900 | − | 1000 | x | − | 1375 2 | ( | 69 10 | − | x | ) |
| 0 | + | 500000 69 | x | = | 6900 | − | 1000 | x | − | 1375 2 | ( | 69 10 | − | x | ) |
| 0 | + | 500000 69 | x | = | 6900 | − | 1000 | x | − | 1375 2 | × | 69 10 | + | 1375 2 | x |
| 0 | + | 500000 69 | x | = | 6900 | − | 1000 | x | − | 18975 4 | + | 1375 2 | x |
| 0 | + | 500000 69 | x | = | 8625 4 | − | 625 2 | x |
500000 69 | x | + | 625 2 | x | = | 8625 4 |
1043125 138 | x | = | 8625 4 |
| x | = | 8625 4 | ÷ | 1043125 138 |
| = | 8625 4 | × | 138 1043125 |
| = | 69 2 | × | 69 8345 |
| x | = | 4761 16690 |
| x | = | 0.285261 |