| 100 | + | x | ÷ | 165 | + | x | = | 309 500 |
| Left side of the equation = | 100 | + | 166 165 | x |
| 100 | + | 166 165 | x | = | 309 500 |
166 165 | x | = | 309 500 | − | 100 |
166 165 | x | = | - | 49691 500 |
| x | = | - | 49691 500 | ÷ | 166 165 |
| = | - | 49691 500 | × | 165 166 |
| = | - | 49691 100 | × | 33 166 |
| x | = | - | 1639803 16600 |
| x | = | - 98.783313 |