| X | − | 3 20 | X | − | 1 20 | X | − | 3 | = | 152 | + | 1 5 | × | 152 |
| Left side of the equation = | 4 5 | X | − | 3 |
4 5 | X | − | 3 | = | 152 | + | 1 5 | × | 152 |
| Right side of the equation = | 152 | + | 152 5 |
| = | 912 5 |
4 5 | X | − | 3 | = | 912 5 |
4 5 | X | = | 912 5 | + | 3 |
4 5 | X | = | 927 5 |
| X | = | 927 5 | ÷ | 4 5 |
| = | 927 5 | × | 5 4 |
| = | 927 | × | 1 4 |
| X | = | 927 4 |
| X | = | 231.75 |