| ( | 3 4 | x | − | 240 | ) | ÷ | 9100 | = | ( | 3 4 | x | − | 615 2 | ) | ÷ | 9000 |
| 方程左边 = | 3 4 | x | × | 1 9100 | − | 240 | × | 1 9100 |
| = | 3 36400 | x | − | 12 455 |
3 36400 | x | − | 12 455 | = | ( | 3 4 | x | − | 615 2 | ) | ÷ | 9000 |
| 方程右边 = | 3 4 | x | × | 1 9000 | − | 615 2 | × | 1 9000 |
| = | 1 12000 | x | − | 41 1200 |
3 36400 | x | − | 12 455 | = | 1 12000 | x | − | 41 1200 |
3 36400 | x | − | 1 12000 | x | = | - | 41 1200 | + | 12 455 |
| - | 1 1092000 | x | = | - | 41 1200 | + | 12 455 |
| - | 1 1092000 | x | = | - | 851 109200 |
851 109200 | = | 1 1092000 | x |
1 1092000 | x | = | 851 109200 |
| x | = | 851 109200 | ÷ | 1 1092000 |
| = | 851 109200 | × | 1092000 |
| = | 851 | × | 10 |
| x | = | 8510 |