| 390 | × | 1 10 | x | + | 4200 | × | 4 25 | x | + | 9 500 | × | 2100 | x | = | 3 4 | × | 126 | ( | 255 | − | x | ) |
| 方程左边 = | 39 | x | + | 672 | x | + | 189 5 | x |
| = | 3744 5 | x |
3744 5 | x | = | 3 4 | × | 126 | ( | 255 | − | x | ) |
| 方程右边 = | 189 2 | ( | 255 | − | x | ) |
3744 5 | x | = | 189 2 | ( | 255 | − | x | ) |
| 方程右边 = | 189 2 | × | 255 | − | 189 2 | x |
| = | 48195 2 | − | 189 2 | x |
3744 5 | x | = | 48195 2 | − | 189 2 | x |
3744 5 | x | + | 189 2 | x | = | 48195 2 |
8433 10 | x | = | 48195 2 |
| x | = | 48195 2 | ÷ | 8433 10 |
| = | 48195 2 | × | 10 8433 |
| = | 5355 | × | 5 937 |
| x | = | 26775 937 |
| x | = | 28.57524 |