| 300 | × | 15 | = | 75 | × | 5 | + | 10 | x | + | 235 | × | 15 |
| Left side of the equation = | 4500 |
| 4500 | = | 75 | × | 5 | + | 10 | x | + | 235 | × | 15 |
| Right side of the equation = | 375 | + | 10 | x | + | 3525 |
| = | 3900 | + | 10 | x |
| 4500 | = | 3900 | + | 10 | x |
| - | 10 | x | = | 3900 | − | 4500 |
| - | 10 | x | = | - | 600 |
| 600 | = | 10 | x |
| 10 | x | = | 600 |
| x | = | 600 | ÷ | 10 |
| = | 600 | × | 1 10 |
| = | 60 | × | 1 |
| x | = | 60 |