119 10 | × | 300 | x | ( | 1300 | − | x | ) | − | 300 | × | 763 | × | 40 | = | 150000000 |
| 方程左边 = | 3570 | x | ( | 1300 | − | x | ) | − | 9156000 |
| 3570 | x | ( | 1300 | − | x | ) | − | 9156000 | = | 150000000 |
| 方程左边 = | 3570 | x | × | 1300 | − | 3570 | x | x | − | 9156000 |
| = | 4641000 | x | − | 3570 | x | x | − | 9156000 |
| 4641000 | x | − | 3570 | x | x | − | 9156000 | = | 150000000 |