( | x | + | 10 | + | x | ) | × | 5 | = | ( | x | + | 10 | + | 10 | + | x | + | 10 | ) | × | 4 |
方程左边 = | x | × | 5 | + | 10 | × | 5 | + | x | × | 5 |
= | x | × | 5 | + | 50 | + | x | × | 5 |
= | 10 | x | + | 50 |
10 | x | + | 50 | = | ( | x | + | 10 | + | 10 | + | x | + | 10 | ) | × | 4 |
方程右边 = | x | × | 4 | + | 10 | × | 4 | + | 10 | × | 4 | + | x | × | 4 | + | 10 | × | 4 |
= | x | × | 4 | + | 40 | + | 40 | + | x | × | 4 | + | 40 |
= | 8 | x | + | 120 |
10 | x | + | 50 | = | 8 | x | + | 120 |
10 | x | − | 8 | x | = | 120 | − | 50 |
2 | x | = | 120 | − | 50 |
2 | x | = | 70 |
x | = | 70 | ÷ | 2 |
= | 70 | × | 1 2 |
= | 35 | × | 1 |
x | = | 35 |