| X | − | 1 5 | X | − | 1 20 | X | − | 3 | = | 56 | + | 1 5 | × | 56 |
| Left side of the equation = | 3 4 | X | − | 3 |
3 4 | X | − | 3 | = | 56 | + | 1 5 | × | 56 |
| Right side of the equation = | 56 | + | 56 5 |
| = | 336 5 |
3 4 | X | − | 3 | = | 336 5 |
3 4 | X | = | 336 5 | + | 3 |
3 4 | X | = | 351 5 |
| X | = | 351 5 | ÷ | 3 4 |
| = | 351 5 | × | 4 3 |
| = | 117 5 | × | 4 |
| X | = | 468 5 |
| X | = | 93.6 |