191 | + | 8 | ( | 129 | − | 2 | x | ) | = | 985 | + | 7 | ( | 154 | − | 8 | x | ) |
方程左边 = | 191 | + | 8 | × | 129 | − | 8 | × | 2 | x |
= | 191 | + | 1032 | − | 16 | x |
= | 1223 | − | 16 | x |
1223 | − | 16 | x | = | 985 | + | 7 | ( | 154 | − | 8 | x | ) |
方程右边 = | 985 | + | 7 | × | 154 | − | 7 | × | 8 | x |
= | 985 | + | 1078 | − | 56 | x |
= | 2063 | − | 56 | x |
1223 | − | 16 | x | = | 2063 | − | 56 | x |
- | 16 | x | + | 56 | x | = | 2063 | − | 1223 |
40 | x | = | 2063 | − | 1223 |
40 | x | = | 840 |
x | = | 840 | ÷ | 40 |
= | 840 | × | 1 40 |
= | 21 | × | 1 |
x | = | 21 |