198 25 | ( | c | + | 33 10 | ) | = | 329 25 |
| 方程左边 = | 198 25 | c | + | 198 25 | × | 33 10 |
| = | 198 25 | c | + | 3267 125 |
198 25 | c | + | 3267 125 | = | 329 25 |
198 25 | c | = | 329 25 | − | 3267 125 |
198 25 | c | = | - | 1622 125 |
| c | = | - | 1622 125 | ÷ | 198 25 |
| = | - | 1622 125 | × | 25 198 |
| = | - | 811 5 | × | 1 99 |
| c | = | - | 811 495 |
| c | = | - 1.638384 |