| x | × | 4 5 | + | ( | 1650 | − | x | ) | × | 21 100 | = | 1650 | × | 7 20 |
| 方程左边 = | 4 5 | x | + | 1650 | × | 21 100 | − | x | × | 21 100 |
| = | 4 5 | x | + | 693 2 | − | x | × | 21 100 |
| = | 59 100 | x | + | 693 2 |
59 100 | x | + | 693 2 | = | 1650 | × | 7 20 |
| 方程右边 = | 1155 2 |
59 100 | x | + | 693 2 | = | 1155 2 |
59 100 | x | = | 1155 2 | − | 693 2 |
59 100 | x | = | 231 |
| x | = | 231 | ÷ | 59 100 |
| = | 231 | × | 100 59 |
| x | = | 23100 59 |
| x | = | 391.525424 |