| 1200 | × | 300 | × | 9 10 | − | 3240 | x | + | 1250 | × | 200 | − | 150 | × | 1200 | ÷ | 1250 | × | 200 | + | 150 | = | 1 5 |
| Left side of the equation = | 324000 | − | 3240 | x | + | 250000 | − | 28800 | + | 180000 |
| = | 725200 | − | 3240 | x |
| 725200 | − | 3240 | x | = | 1 5 |
| - | 3240 | x | = | 1 5 | − | 725200 |
| - | 3240 | x | = | - | 3625999 5 |
3625999 5 | = | 3240 | x |
| 3240 | x | = | 3625999 5 |
| x | = | 3625999 5 | ÷ | 3240 |
| = | 3625999 5 | × | 1 3240 |
| x | = | 3625999 16200 |
| x | = | 223.827099 |