| 35 | x | + | 35 | × | 1 2 | ( | 12 | − | x | ) | = | 350 |
| Left side of the equation = | 35 | x | + | 35 2 | ( | 12 | − | x | ) |
| 35 | x | + | 35 2 | ( | 12 | − | x | ) | = | 350 |
| Left side of the equation = | 35 | x | + | 35 2 | × | 12 | − | 35 2 | x |
| = | 35 | x | + | 210 | − | 35 2 | x |
| = | 35 2 | x | + | 210 |
35 2 | x | + | 210 | = | 350 |
35 2 | x | = | 350 | − | 210 |
35 2 | x | = | 140 |
| x | = | 140 | ÷ | 35 2 |
| = | 140 | × | 2 35 |
| = | 4 | × | 2 |
| x | = | 8 |