| X | − | 1 5 | X | − | 1 20 | X | − | 3 | = | 52 | + | 1 5 | × | 52 |
| Left side of the equation = | 3 4 | X | − | 3 |
3 4 | X | − | 3 | = | 52 | + | 1 5 | × | 52 |
| Right side of the equation = | 52 | + | 52 5 |
| = | 312 5 |
3 4 | X | − | 3 | = | 312 5 |
3 4 | X | = | 312 5 | + | 3 |
3 4 | X | = | 327 5 |
| X | = | 327 5 | ÷ | 3 4 |
| = | 327 5 | × | 4 3 |
| = | 109 5 | × | 4 |
| X | = | 436 5 |
| X | = | 87.2 |