313 10 | + | x | − | x | × | 6 100 | × | 3 | ÷ | 12 | = | 51 |
| Left side of the equation = | 313 10 | + | x | − | x | × | 3 200 |
| = | 313 10 | + | 197 200 | x |
313 10 | + | 197 200 | x | = | 51 |
197 200 | x | = | 51 | − | 313 10 |
197 200 | x | = | 197 10 |
| x | = | 197 10 | ÷ | 197 200 |
| = | 197 10 | × | 200 197 |
| = | 197 | × | 20 197 |
| x | = | 3940 197 |
| x | = | 20 |