| 25 | × | 156 25 | + | 327 25 | c | = | ( | 25 | + | c | ) | × | 198 25 |
| 方程左边 = | 156 | + | 327 25 | c |
| 156 | + | 327 25 | c | = | ( | 25 | + | c | ) | × | 198 25 |
| 方程右边 = | 25 | × | 198 25 | + | c | × | 198 25 |
| = | 198 | + | c | × | 198 25 |
| 156 | + | 327 25 | c | = | 198 | + | 198 25 | c |
327 25 | c | − | 198 25 | c | = | 198 | − | 156 |
129 25 | c | = | 198 | − | 156 |
129 25 | c | = | 42 |
| c | = | 42 | ÷ | 129 25 |
| = | 42 | × | 25 129 |
| = | 14 | × | 25 43 |
| c | = | 350 43 |
| c | = | 8.139535 |