| a | = | 1200 | − | 1100 | ( | ( | 29 50000 | a | + | 124 125 | ) | ÷ | ( | 109 100000 | a | + | 1687 500 | ) | ) |
| a | = | 1200 | − | 1100 | ( | 29 50000 | a | + | 124 125 | ) | ÷ | ( | 109 100000 | a | + | 1687 500 | ) |
| 方程两边同时乘以: | ( | 109 100000 | a | + | 1687 500 | ) |
| a | ( | 109 100000 | a | + | 1687 500 | ) | = | 1200 | ( | 109 100000 | a | + | 1687 500 | ) | − | 1100 | ( | 29 50000 | a | + | 124 125 | ) |
| a | × | 109 100000 | a | + | a | × | 1687 500 | = | 1200 | ( | 109 100000 | a | + | 1687 500 | ) | − | 1100 | ( | 29 50000 | a | + | 124 125 | ) |
| a | × | 109 100000 | a | + | a | × | 1687 500 | = | 1200 | × | 109 100000 | a | + | 1200 | × | 1687 500 | − | 1100 | ( | 29 50000 | a | + | 124 125 | ) |
| a | × | 109 100000 | a | + | a | × | 1687 500 | = | 327 250 | a | + | 20244 5 | − | 1100 | ( | 29 50000 | a | + | 124 125 | ) |
| a | × | 109 100000 | a | + | 1687 500 | a | = | 327 250 | a | + | 20244 5 | − | 1100 | × | 29 50000 | a | − | 1100 | × | 124 125 |
| a | × | 109 100000 | a | + | 1687 500 | a | = | 327 250 | a | + | 20244 5 | − | 319 500 | a | − | 5456 5 |
| a | × | 109 100000 | a | + | 1687 500 | a | = | 67 100 | a | + | 14788 5 |