| ( | x | + | 302 | ) | ÷ | ( | x | + | 524 | ) | = | 7 10 |
| 方程两边同时乘以: | ( | x | + | 524 | ) |
| ( | x | + | 302 | ) | = | 7 10 | ( | x | + | 524 | ) |
| x | + | 302 | = | 7 10 | ( | x | + | 524 | ) |
| x | + | 302 | = | 7 10 | x | + | 7 10 | × | 524 |
| x | + | 302 | = | 7 10 | x | + | 1834 5 |
| x | − | 7 10 | x | = | 1834 5 | − | 302 |
3 10 | x | = | 1834 5 | − | 302 |
3 10 | x | = | 324 5 |
| x | = | 324 5 | ÷ | 3 10 |
| = | 324 5 | × | 10 3 |
| = | 108 | × | 2 |
| x | = | 216 |