357 1000 | = | ( | 81 | − | x | ) | ÷ | ( | x | − | 71 | ) |
| 方程两边同时乘以: | ( | x | − | 71 | ) |
357 1000 | ( | x | − | 71 | ) | = | ( | 81 | − | x | ) |
357 1000 | x | − | 357 1000 | × | 71 | = | ( | 81 | − | x | ) |
357 1000 | x | − | 357 1000 | × | 71 | = | 81 | − | x |
357 1000 | x | − | 25347 1000 | = | 81 | − | x |
357 1000 | x | + | x | = | 81 | + | 25347 1000 |
1357 1000 | x | = | 81 | + | 25347 1000 |
1357 1000 | x | = | 106347 1000 |
| x | = | 106347 1000 | ÷ | 1357 1000 |
| = | 106347 1000 | × | 1000 1357 |
| = | 106347 | × | 1 1357 |
| x | = | 106347 1357 |
| x | = | 78.369197 |