| 10 | x | × | 3 | + | 66 5 | x | × | 2 | = | x | + | ( | x | + | 300 | ) |
| Left side of the equation = | 30 | x | + | 132 5 | x |
| = | 282 5 | x |
282 5 | x | = | x | + | ( | x | + | 300 | ) |
| Right side of the equation = | x | + | x | + | 300 |
| = | 2 | x | + | 300 |
282 5 | x | = | 2 | x | + | 300 |
282 5 | x | − | 2 | x | = | 300 |
272 5 | x | = | 300 |
| x | = | 300 | ÷ | 272 5 |
| = | 300 | × | 5 272 |
| = | 75 | × | 5 68 |
| x | = | 375 68 |
| x | = | 5.514706 |