| ( | 10 | + | x | ) | ( | 10 | + | x | ) | ÷ | 8 | × | 157 50 | = | 50 |
| 方程左边 = | ( | 10 | + | x | ) | ( | 10 | + | x | ) | × | 157 400 |
| ( | 10 | + | x | ) | ( | 10 | + | x | ) | × | 157 400 | = | 50 |
| 方程左边 = | 10 | ( | 10 | + | x | ) | × | 157 400 | + | x | ( | 10 | + | x | ) | × | 157 400 |
| = | 157 40 | ( | 10 | + | x | ) | + | x | ( | 10 | + | x | ) | × | 157 400 |
| = | 157 40 | × | 10 | + | 157 40 | x | + | x | ( | 10 | + | x | ) | × | 157 400 |
| = | 157 4 | + | 157 40 | x | + | x | ( | 10 | + | x | ) | × | 157 400 |
| = | 157 4 | + | 157 40 | x | + | x | × | 10 | × | 157 400 | + | x | x | × | 157 400 |
| = | 157 4 | + | 157 40 | x | + | x | × | 157 40 | + | x | x | × | 157 400 |
| = | 157 4 | + | 157 20 | x | + | x | x | × | 157 400 |
157 4 | + | 157 20 | x | + | x | x | × | 157 400 | = | 50 |