| 12 | c | = | ( | 17 5 | + | c | ) | × | 399 50 |
| Right side of the equation = | 17 5 | × | 399 50 | + | c | × | 399 50 |
| = | 6783 250 | + | c | × | 399 50 |
| 12 | c | = | 6783 250 | + | 399 50 | c |
| 12 | c | − | 399 50 | c | = | 6783 250 |
201 50 | c | = | 6783 250 |
| c | = | 6783 250 | ÷ | 201 50 |
| = | 6783 250 | × | 50 201 |
| = | 2261 5 | × | 1 67 |
| c | = | 2261 335 |
| c | = | 6.749254 |