657 50 | c | = | ( | 33 10 | + | c | ) | × | 173 25 |
| 方程右边 = | 33 10 | × | 173 25 | + | c | × | 173 25 |
| = | 5709 250 | + | c | × | 173 25 |
657 50 | c | = | 5709 250 | + | 173 25 | c |
657 50 | c | − | 173 25 | c | = | 5709 250 |
311 50 | c | = | 5709 250 |
| c | = | 5709 250 | ÷ | 311 50 |
| = | 5709 250 | × | 50 311 |
| = | 5709 5 | × | 1 311 |
| c | = | 5709 1555 |
| c | = | 3.671383 |