| 170 | x | ÷ | 117 2 | + | 170 | ( | 25 | − | x | ) | ÷ | 149 2 | = | 68 |
| 方程左边 = | 340 117 | x | + | 340 149 | ( | 25 | − | x | ) |
340 117 | x | + | 340 149 | ( | 25 | − | x | ) | = | 68 |
| 方程左边 = | 340 117 | x | + | 340 149 | × | 25 | − | 340 149 | x |
| = | 340 117 | x | + | 8500 149 | − | 340 149 | x |
| = | 10880 17433 | x | + | 8500 149 |
10880 17433 | x | + | 8500 149 | = | 68 |
10880 17433 | x | = | 68 | − | 8500 149 |
10880 17433 | x | = | 1632 149 |
| x | = | 1632 149 | ÷ | 10880 17433 |
| = | 1632 149 | × | 17433 10880 |
| = | 3 149 | × | 17433 20 |
| x | = | 52299 2980 |
| x | = | 17.55 |