| ( | 5 | ( | 19 | + | X | ) | + | 1 | × | 4 | + | 4 | × | 2 | + | 2 | × | 1 | + | 3 | × | 2 | ) | ÷ | ( | 28 | + | X | ) | = | 22 5 |
| 方程两边同时乘以: | ( | 28 | + | X | ) |
| ( | 5 | ( | 19 | + | X | ) | + | 1 | × | 4 | + | 4 | × | 2 | + | 2 | × | 1 | + | 3 | × | 2 | ) | = | 22 5 | ( | 28 | + | X | ) |
| 5 | ( | 19 | + | X | ) | + | 1 | × | 4 | + | 4 | × | 2 | + | 2 | × | 1 | + | 3 | × | 2 | = | 22 5 | ( | 28 | + | X | ) |
| 5 | ( | 19 | + | X | ) | + | 1 | × | 4 | + | 4 | × | 2 | + | 2 | × | 1 | + | 3 | × | 2 | = | 22 5 | × | 28 | + | 22 5 | X |
| 5 | ( | 19 | + | X | ) | + | 4 | + | 8 | + | 2 | + | 6 | = | 616 5 | + | 22 5 | X |
| 5 | ( | 19 | + | X | ) | + | 20 | = | 616 5 | + | 22 5 | X |
| 5 | × | 19 | + | 5 | X | + | 20 | = | 616 5 | + | 22 5 | X |
| 95 | + | 5 | X | + | 20 | = | 616 5 | + | 22 5 | X |
| 115 | + | 5 | X | = | 616 5 | + | 22 5 | X |
| 5 | X | − | 22 5 | X | = | 616 5 | − | 115 |
3 5 | X | = | 616 5 | − | 115 |
3 5 | X | = | 41 5 |
| X | = | 41 5 | ÷ | 3 5 |
| = | 41 5 | × | 5 3 |
| = | 41 | × | 1 3 |
| X | = | 41 3 |
| X | = | 13.666667 |