| ( | 99 100 | + | x | ) | = | 309 500 | ( | 33 20 | + | x | ) |
| 方程左边 = | 99 100 | + | x |
99 100 | + | x | = | 309 500 | ( | 33 20 | + | x | ) |
| 方程右边 = | 309 500 | × | 33 20 | + | 309 500 | x |
| = | 10197 10000 | + | 309 500 | x |
99 100 | + | x | = | 10197 10000 | + | 309 500 | x |
| x | − | 309 500 | x | = | 10197 10000 | − | 99 100 |
191 500 | x | = | 10197 10000 | − | 99 100 |
191 500 | x | = | 297 10000 |
| x | = | 297 10000 | ÷ | 191 500 |
| = | 297 10000 | × | 500 191 |
| = | 297 20 | × | 1 191 |
| x | = | 297 3820 |
| x | = | 0.077749 |