| 1 | ÷ | 1561 5 | − | 1 | ÷ | 80 | − | x | = | 1 | ÷ | 88 | − | 1 | ÷ | 390 | − | x |
| Left side of the equation = | 5 1561 | − | 1 80 | − | x |
| = | - | 1161 124880 | − | x |
| - | 1161 124880 | − | x | = | 1 | ÷ | 88 | − | 1 | ÷ | 390 | − | x |
| Right side of the equation = | 1 88 | − | 1 390 | − | x |
| = | 151 17160 | − | x |
| - | 1161 124880 | − | x | = | 151 17160 | − | x |
| - | x | + | x | = | 151 17160 | + | 1161 124880 |
| - | 0 | x | = | 151 17160 | + | 1161 124880 |
| - | 0 | x | = | 969491 53573520 |