| 433 | + | ( | 433 | − | 100 | ) | ( | a | × | 1 200 | ) | = | 75601 100 |
| 方程左边 = | 433 | + | 433 | ( | a | × | 1 200 | ) | − | 100 | ( | a | × | 1 200 | ) |
| = | 433 | + | 433 | a | × | 1 200 | − | 100 | ( | a | × | 1 200 | ) |
| = | 433 | + | 433 200 | a | − | 100 | ( | a | × | 1 200 | ) |
| = | 433 | + | 433 200 | a | − | 100 | a | × | 1 200 |
| = | 433 | + | 433 200 | a | − | 1 2 | a |
| = | 433 | + | 333 200 | a |
| 433 | + | 333 200 | a | = | 75601 100 |
333 200 | a | = | 75601 100 | − | 433 |
333 200 | a | = | 32301 100 |
| a | = | 32301 100 | ÷ | 333 200 |
| = | 32301 100 | × | 200 333 |
| = | 97 | × | 2 |
| a | = | 194 |