| ( | 60 | + | x | ) | × | 41 4 | = | ( | 80 | + | x | ) | × | 10 |
| 方程左边 = | 60 | × | 41 4 | + | x | × | 41 4 |
| = | 615 | + | x | × | 41 4 |
| 615 | + | 41 4 | x | = | ( | 80 | + | x | ) | × | 10 |
| 方程右边 = | 80 | × | 10 | + | x | × | 10 |
| = | 800 | + | x | × | 10 |
| 615 | + | 41 4 | x | = | 800 | + | 10 | x |
41 4 | x | − | 10 | x | = | 800 | − | 615 |
1 4 | x | = | 800 | − | 615 |
1 4 | x | = | 185 |
| x | = | 185 | ÷ | 1 4 |
| = | 185 | × | 4 |
| x | = | 740 |