| ( | ( | 800 | − | 1216893 100 | + | X | ) | × | 3 4 | ) | ÷ | 27000 | × | 100 | = | 1 20 |
| 方程左边 = | ( | ( | 800 | − | 1216893 100 | + | X | ) | × | 3 4 | ) | × | 1 270 |
| ( | ( | 800 | − | 1216893 100 | + | X | ) | × | 3 4 | ) | × | 1 270 | = | 1 20 |
| 方程左边 = | ( | 800 | − | 1216893 100 | + | X | ) | × | 3 4 | × | 1 270 |
| = | ( | 800 | − | 1216893 100 | + | X | ) | × | 1 360 |
| = | 800 | × | 1 360 | − | 1216893 100 | × | 1 360 | + | X | × | 1 360 |
| = | 20 9 | − | 405631 12000 | + | X | × | 1 360 |
| = | - | 1136893 36000 | + | 1 360 | X |
| - | 1136893 36000 | + | 1 360 | X | = | 1 20 |
1 360 | X | = | 1 20 | + | 1136893 36000 |
1 360 | X | = | 1138693 36000 |
| X | = | 1138693 36000 | ÷ | 1 360 |
| = | 1138693 36000 | × | 360 |
| = | 1138693 100 | × | 1 |
| X | = | 1138693 100 |
| X | = | 11386.93 |