75 100 | = | ( | x | + | 40 100 | + | 9 100 | + | 7 100 | ) | + | 7 100 | ( | x | + | 40 100 | + | 9 100 | + | 7 100 | ) |
| 方程右边 = | x | + | 40 100 | + | 9 100 | + | 7 100 | + | 7 100 | ( | x | + | 40 100 | + | 9 100 | + | 7 100 | ) |
| = | x | + | 14 25 | + | 7 100 | ( | x | + | 40 100 | + | 9 100 | + | 7 100 | ) |
| = | x | + | 14 25 | + | 7 100 | x | + | 7 100 | × | 40 100 | + | 7 100 | × | 9 100 | + | 7 100 | × | 7 100 |
| = | x | + | 14 25 | + | 7 100 | x | + | 7 250 | + | 63 10000 | + | 49 10000 |
| = | 107 100 | x | + | 749 1250 |
75 100 | = | 107 100 | x | + | 749 1250 |
| - | 107 100 | x | = | 749 1250 | − | 75 100 |
| - | 107 100 | x | = | - | 377 2500 |
377 2500 | = | 107 100 | x |
107 100 | x | = | 377 2500 |
| x | = | 377 2500 | ÷ | 107 100 |
| = | 377 2500 | × | 100 107 |
| = | 377 25 | × | 1 107 |
| x | = | 377 2675 |
| x | = | 0.140935 |