| 100 | X | × | 8 | = | X | + | ( | 20 | + | 5 | ) | × | 8 |
| Left side of the equation = | 800 | X |
| 800 | X | = | X | + | ( | 20 | + | 5 | ) | × | 8 |
| Right side of the equation = | X | + | 20 | × | 8 | + | 5 | × | 8 |
| = | X | + | 160 | + | 40 |
| = | X | + | 200 |
| 800 | X | = | X | + | 200 |
| 800 | X | − | X | = | 200 |
| 799 | X | = | 200 |
| X | = | 200 | ÷ | 799 |
| = | 200 | × | 1 799 |
| X | = | 200 799 |
| X | = | 0.250313 |