| ( | 10 | + | x | ) | ( | 10 | + | x | ) | × | 157 50 | = | 50 |
| Left side of the equation = | 10 | ( | 10 | + | x | ) | × | 157 50 | + | x | ( | 10 | + | x | ) | × | 157 50 |
| = | 157 5 | ( | 10 | + | x | ) | + | x | ( | 10 | + | x | ) | × | 157 50 |
| = | 157 5 | × | 10 | + | 157 5 | x | + | x | ( | 10 | + | x | ) | × | 157 50 |
| = | 314 | + | 157 5 | x | + | x | ( | 10 | + | x | ) | × | 157 50 |
| = | 314 | + | 157 5 | x | + | x | × | 10 | × | 157 50 | + | x | x | × | 157 50 |
| = | 314 | + | 157 5 | x | + | x | × | 157 5 | + | x | x | × | 157 50 |
| = | 314 | + | 314 5 | x | + | x | x | × | 157 50 |
| 314 | + | 314 5 | x | + | x | x | × | 157 50 | = | 50 |