| ( | x | − | 15000 | ) | × | 3 4 | ÷ | 100000 | = | ( | x | − | 10000 | ) | × | 3 4 | ÷ | ( | 100000 | + | 5000 | ) |
| 方程两边同时乘以: | ( | 100000 | + | 5000 | ) |
| ( | x | − | 15000 | ) | × | 3 4 | ÷ | 100000 | × | ( | 100000 | + | 5000 | ) | = | ( | x | − | 10000 | ) | × | 3 4 |
| x | × | 3 4 | ÷ | 100000 | × | ( | 100000 | + | 5000 | ) | − | 15000 | × | 3 4 | ÷ | 100000 | × | ( | 100000 | + | 5000 | ) | = | ( | x | − | 10000 | ) | × | 3 4 |
| x | × | 3 4 | ÷ | 100000 | × | ( | 100000 | + | 5000 | ) | − | 15000 | × | 3 4 | ÷ | 100000 | × | ( | 100000 | + | 5000 | ) | = | x | × | 3 4 | − | 10000 | × | 3 4 |
| x | × | 3 400000 | ( | 100000 | + | 5000 | ) | − | 9 80 | ( | 100000 | + | 5000 | ) | = | x | × | 3 4 | − | 7500 |
| x | × | 3 400000 | × | 100000 | + | x | × | 3 400000 | × | 5000 | − | 9 80 | ( | 100000 | + | 5000 | ) | = | 3 4 | x | − | 7500 |
| x | × | 3 4 | + | x | × | 3 80 | − | 9 80 | ( | 100000 | + | 5000 | ) | = | 3 4 | x | − | 7500 |
63 80 | x | − | 9 80 | ( | 100000 | + | 5000 | ) | = | 3 4 | x | − | 7500 |
63 80 | x | − | 9 80 | × | 100000 | − | 9 80 | × | 5000 | = | 3 4 | x | − | 7500 |
63 80 | x | − | 11250 | − | 1125 2 | = | 3 4 | x | − | 7500 |
63 80 | x | − | 23625 2 | = | 3 4 | x | − | 7500 |
63 80 | x | − | 3 4 | x | = | - | 7500 | + | 23625 2 |
3 80 | x | = | - | 7500 | + | 23625 2 |
3 80 | x | = | 8625 2 |
| x | = | 8625 2 | ÷ | 3 80 |
| = | 8625 2 | × | 80 3 |
| = | 2875 | × | 40 |
| x | = | 115000 |