| 320 | ÷ | 30 | × | x | + | 203 | ÷ | 30 | × | ( | x | + | 15 | ) | + | 82 | ÷ | 30 | × | ( | x | + | 30 | ) | = | 1200 |
| Left side of the equation = | 32 3 | x | + | 203 30 | ( | x | + | 15 | ) | + | 41 15 | ( | x | + | 30 | ) |
32 3 | x | + | 203 30 | ( | x | + | 15 | ) | + | 41 15 | ( | x | + | 30 | ) | = | 1200 |
| Left side of the equation = | 32 3 | x | + | 203 30 | x | + | 203 30 | × | 15 | + | 41 15 | ( | x | + | 30 | ) |
| = | 32 3 | x | + | 203 30 | x | + | 203 2 | + | 41 15 | ( | x | + | 30 | ) |
| = | 523 30 | x | + | 203 2 | + | 41 15 | ( | x | + | 30 | ) |
| = | 523 30 | x | + | 203 2 | + | 41 15 | x | + | 41 15 | × | 30 |
| = | 523 30 | x | + | 203 2 | + | 41 15 | x | + | 82 |
| = | 121 6 | x | + | 367 2 |
121 6 | x | + | 367 2 | = | 1200 |
121 6 | x | = | 1200 | − | 367 2 |
121 6 | x | = | 2033 2 |
| x | = | 2033 2 | ÷ | 121 6 |
| = | 2033 2 | × | 6 121 |
| = | 2033 | × | 3 121 |
| x | = | 6099 121 |
| x | = | 50.404959 |