| ( | 105 | − | x | ) | x | × | 1 | ÷ | 3 | + | 1 | ÷ | 4 | × | x | = | 30 |
| Left side of the equation = | ( | 105 | − | x | ) | x | × | 1 3 | + | 1 4 | x |
| ( | 105 | − | x | ) | x | × | 1 3 | + | 1 4 | x | = | 30 |
| Left side of the equation = | 105 | x | × | 1 3 | − | x | x | × | 1 3 | + | 1 4 | x |
| = | 35 | x | − | x | x | × | 1 3 | + | 1 4 | x |
| = | 141 4 | x | − | x | x | × | 1 3 |
141 4 | x | − | x | x | × | 1 3 | = | 30 |