| 45 | × | 3 | − | 37 | x | = | 25 | × | 4 | − | 32 | x |
| Left side of the equation = | 135 | − | 37 | x |
| 135 | − | 37 | x | = | 25 | × | 4 | − | 32 | x |
| Right side of the equation = | 100 | − | 32 | x |
| 135 | − | 37 | x | = | 100 | − | 32 | x |
| - | 37 | x | + | 32 | x | = | 100 | − | 135 |
| - | 5 | x | = | 100 | − | 135 |
| - | 5 | x | = | - | 35 |
| 35 | = | 5 | x |
| 5 | x | = | 35 |
| x | = | 35 | ÷ | 5 |
| = | 35 | × | 1 5 |
| = | 7 | × | 1 |
| x | = | 7 |