| 30 | × | 152 25 | + | 1191 100 | c | = | ( | 30 | + | c | ) | × | 399 50 |
| Left side of the equation = | 912 5 | + | 1191 100 | c |
912 5 | + | 1191 100 | c | = | ( | 30 | + | c | ) | × | 399 50 |
| Right side of the equation = | 30 | × | 399 50 | + | c | × | 399 50 |
| = | 1197 5 | + | c | × | 399 50 |
912 5 | + | 1191 100 | c | = | 1197 5 | + | 399 50 | c |
1191 100 | c | − | 399 50 | c | = | 1197 5 | − | 912 5 |
393 100 | c | = | 1197 5 | − | 912 5 |
393 100 | c | = | 57 |
| c | = | 57 | ÷ | 393 100 |
| = | 57 | × | 100 393 |
| = | 19 | × | 100 131 |
| c | = | 1900 131 |
| c | = | 14.503817 |