| 1275 | x | ÷ | 11 | − | 3 | = | ( | 20 | − | x | ) | × | 8400 | ÷ | 43 |
| 方程左边 = | 1275 11 | x | − | 3 |
1275 11 | x | − | 3 | = | ( | 20 | − | x | ) | × | 8400 | ÷ | 43 |
| 方程右边 = | ( | 20 | − | x | ) | × | 8400 43 |
1275 11 | x | − | 3 | = | ( | 20 | − | x | ) | × | 8400 43 |
| 方程右边 = | 20 | × | 8400 43 | − | x | × | 8400 43 |
| = | 168000 43 | − | x | × | 8400 43 |
1275 11 | x | − | 3 | = | 168000 43 | − | 8400 43 | x |
1275 11 | x | + | 8400 43 | x | = | 168000 43 | + | 3 |
147225 473 | x | = | 168000 43 | + | 3 |
147225 473 | x | = | 168129 43 |
| x | = | 168129 43 | ÷ | 147225 473 |
| = | 168129 43 | × | 473 147225 |
| = | 4311 | × | 11 3775 |
| x | = | 47421 3775 |
| x | = | 12.561854 |