| ( | 10000 | + | 880 | a | ) | ( | 1 | − | 5 | ÷ | 18 | × | a% | ) | = | ( | 2000 | + | 400 | a | ) | ( | 1 | − | 3 | ÷ | 10 | × | a% | ) | + | ( | 8000 | + | 480 | a | ) | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| 方程左边 = | 10000 | ( | 1 | − | 5 | ÷ | 18 | × | a% | ) | + | 880 | a | ( | 1 | − | 5 | ÷ | 18 | × | a% | ) |
| = | 10000 | × | 1 | − | 10000 | × | 5 | ÷ | 18 | × | a% | + | 880 | a | ( | 1 | − | 5 | ÷ | 18 | × | a% | ) |
| = | 10000 | − | 250 9 | a | + | 880 | a | ( | 1 | − | 5 | ÷ | 18 | × | a% | ) |
| = | 10000 | − | 250 9 | a | + | 880 | a | × | 1 | − | 880 | a | × | 5 | ÷ | 18 | × | a% |
| = | 10000 | − | 250 9 | a | + | 880 | a | − | 22 9 | a | a |
| = | 10000 | + | 7670 9 | a | − | 22 9 | a | a |
| 10000 | + | 7670 9 | a | − | 22 9 | a | a | = | ( | 2000 | + | 400 | a | ) | ( | 1 | − | 3 | ÷ | 10 | × | a% | ) | + | ( | 8000 | + | 480 | a | ) | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| 方程右边 = | 2000 | ( | 1 | − | 3 | ÷ | 10 | × | a% | ) | + | 400 | a | ( | 1 | − | 3 | ÷ | 10 | × | a% | ) | + | ( | 8000 | + | 480 | a | ) | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 2000 | × | 1 | − | 2000 | × | 3 | ÷ | 10 | × | a% | + | 400 | a | ( | 1 | − | 3 | ÷ | 10 | × | a% | ) | + | ( | 8000 | + | 480 | a | ) | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 2000 | − | 6 | a | + | 400 | a | ( | 1 | − | 3 | ÷ | 10 | × | a% | ) | + | ( | 8000 | + | 480 | a | ) | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 2000 | − | 6 | a | + | 400 | a | × | 1 | − | 400 | a | × | 3 | ÷ | 10 | × | a% | + | ( | 8000 | + | 480 | a | ) |
| = | 2000 | − | 6 | a | + | 400 | a | − | 6 5 | a | a | + | ( | 8000 | + | 480 | a | ) | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 2000 | + | 394 | a | − | 6 5 | a | a | + | ( | 8000 | + | 480 | a | ) | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 2000 | + | 394 | a | − | 6 5 | a | a | + | 8000 | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) | + | 480 | a | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 2000 | + | 394 | a | − | 6 5 | a | a | + | 8000 | × | 1 | − | 8000 | × | 1 | ÷ | 4 | × | a% |
| = | 2000 | + | 394 | a | − | 6 5 | a | a | + | 8000 | − | 20 | a | + | 480 | a | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 10000 | + | 374 | a | − | 6 5 | a | a | + | 480 | a | ( | 1 | − | 1 | ÷ | 4 | × | a% | ) |
| = | 10000 | + | 374 | a | − | 6 5 | a | a | + | 480 | a | × | 1 | − | 480 | a | × | 1 |
| = | 10000 | + | 374 | a | − | 6 5 | a | a | + | 480 | a | − | 6 5 | a | a |
| = | 10000 | + | 854 | a | − | 6 5 | a | a | − | 6 5 | a | a |
| 10000 | + | 7670 9 | a | − | 22 9 | a | a | = | 10000 | + | 854 | a | − | 6 5 | a | a | − | 6 5 | a | a |