| 1800 | ( | 19 16 | x | + | 7 | ) | ÷ | 5 | = | 2500 |
| 方程左边 = | 360 | ( | 19 16 | x | + | 7 | ) |
| 360 | ( | 19 16 | x | + | 7 | ) | = | 2500 |
| 方程左边 = | 360 | × | 19 16 | x | + | 360 | × | 7 |
| = | 855 2 | x | + | 2520 |
855 2 | x | + | 2520 | = | 2500 |
855 2 | x | = | 2500 | − | 2520 |
855 2 | x | = | - | 20 |
| x | = | - | 20 | ÷ | 855 2 |
| = | - | 20 | × | 2 855 |
| = | - | 4 | × | 2 171 |
| x | = | - | 8 171 |
| x | = | - 0.046784 |