| x | − | 6 | = | ( | 68 | + | 90 | + | 92 | + | 80 | + | x | ) | ÷ | 5 |
| Right side of the equation = | 68 | × | 1 5 | + | 90 | × | 1 5 | + | 92 | × | 1 5 | + | 80 | × | 1 5 | + | x | × | 1 5 |
| = | 68 5 | + | 18 | + | 92 5 | + | 16 | + | x | × | 1 5 |
| = | 66 | + | 1 5 | x |
| x | − | 6 | = | 66 | + | 1 5 | x |
| x | − | 1 5 | x | = | 66 | + | 6 |
4 5 | x | = | 66 | + | 6 |
4 5 | x | = | 72 |
| x | = | 72 | ÷ | 4 5 |
| = | 72 | × | 5 4 |
| = | 18 | × | 5 |
| x | = | 90 |