| 150 | × | 397 50 | + | 12 | c | = | ( | 150 | + | c | ) | × | 797 100 |
| Left side of the equation = | 1191 | + | 12 | c |
| 1191 | + | 12 | c | = | ( | 150 | + | c | ) | × | 797 100 |
| Right side of the equation = | 150 | × | 797 100 | + | c | × | 797 100 |
| = | 2391 2 | + | c | × | 797 100 |
| 1191 | + | 12 | c | = | 2391 2 | + | 797 100 | c |
| 12 | c | − | 797 100 | c | = | 2391 2 | − | 1191 |
403 100 | c | = | 2391 2 | − | 1191 |
403 100 | c | = | 9 2 |
| c | = | 9 2 | ÷ | 403 100 |
| = | 9 2 | × | 100 403 |
| = | 9 | × | 50 403 |
| c | = | 450 403 |
| c | = | 1.116625 |