| 400 | × | 643 10 | − | 400 | x | = | 150 | × | 1653 10 | − | 150 | x |
| Left side of the equation = | 25720 | − | 400 | x |
| 25720 | − | 400 | x | = | 150 | × | 1653 10 | − | 150 | x |
| Right side of the equation = | 24795 | − | 150 | x |
| 25720 | − | 400 | x | = | 24795 | − | 150 | x |
| - | 400 | x | + | 150 | x | = | 24795 | − | 25720 |
| - | 250 | x | = | 24795 | − | 25720 |
| - | 250 | x | = | - | 925 |
| 925 | = | 250 | x |
| 250 | x | = | 925 |
| x | = | 925 | ÷ | 250 |
| = | 925 | × | 1 250 |
| = | 37 | × | 1 10 |
| x | = | 37 10 |
| x | = | 3.7 |