19 10 | x | ÷ | 3 | = | 171 10 |
| Left side of the equation = | 19 30 | x |
19 30 | x | = | 171 10 |
| x | = | 171 10 | ÷ | 19 30 |
| = | 171 10 | × | 30 19 |
| = | 9 | × | 3 |
| x | = | 27 |
| ( | 2 | x | − | 8 | ) | × | 4 | = | 8 |
| Left side of the equation = | 2 | x | × | 4 | − | 8 | × | 4 |
| = | 8 | x | − | 32 |
| 8 | x | − | 32 | = | 8 |
| 8 | x | = | 8 | + | 32 |
| 8 | x | = | 40 |
| x | = | 40 | ÷ | 8 |
| = | 40 | × | 1 8 |
| = | 5 | × | 1 |
| x | = | 5 |