| 2 | x | + | 13 | = | 14 | + | x |
| 2 | x | − | x | = | 14 | − | 13 |
| x | = | 14 | − | 13 |
| x | = | 14 | − | 13 |
| x | = | 1 |
| 8 | + | 4 | x | = | 2 | x | + | 16 |
| 4 | x | − | 2 | x | = | 16 | − | 8 |
| 2 | x | = | 16 | − | 8 |
| 2 | x | = | 8 |
| x | = | 8 | ÷ | 2 |
| = | 8 | × | 1 2 |
| = | 4 | × | 1 |
| x | = | 4 |
| ( | x | + | 7 | ) | ÷ | 13 10 | = | 30 |
| Left side of the equation = | x | × | 10 13 | + | 7 | × | 10 13 |
| = | x | × | 10 13 | + | 70 13 |
10 13 | x | + | 70 13 | = | 30 |
10 13 | x | = | 30 | − | 70 13 |
10 13 | x | = | 320 13 |
| x | = | 320 13 | ÷ | 10 13 |
| = | 320 13 | × | 13 10 |
| = | 32 | × | 1 |
| x | = | 32 |
| 4 | x | × | 2 | + | 43 | = | 109 | + | 2 | x |
| Left side of the equation = | 8 | x | + | 43 |
| 8 | x | + | 43 | = | 109 | + | 2 | x |
| 8 | x | − | 2 | x | = | 109 | − | 43 |
| 6 | x | = | 109 | − | 43 |
| 6 | x | = | 66 |
| x | = | 66 | ÷ | 6 |
| = | 66 | × | 1 6 |
| = | 11 | × | 1 |
| x | = | 11 |
| 2 | x | × | 3 | + | 44 | = | 132 | − | 2 | x |
| Left side of the equation = | 6 | x | + | 44 |
| 6 | x | + | 44 | = | 132 | − | 2 | x |
| 6 | x | + | 2 | x | = | 132 | − | 44 |
| 8 | x | = | 132 | − | 44 |
| 8 | x | = | 88 |
| x | = | 88 | ÷ | 8 |
| = | 88 | × | 1 8 |
| = | 11 | × | 1 |
| x | = | 11 |
| 4 | x | × | 3 | + | 19 | = | 117 | − | 2 | x |
| Left side of the equation = | 12 | x | + | 19 |
| 12 | x | + | 19 | = | 117 | − | 2 | x |
| 12 | x | + | 2 | x | = | 117 | − | 19 |
| 14 | x | = | 117 | − | 19 |
| 14 | x | = | 98 |
| x | = | 98 | ÷ | 14 |
| = | 98 | × | 1 14 |
| = | 7 | × | 1 |
| x | = | 7 |