( | x | + | 129 | ) | ÷ | ( | x | + | 243 | ) | = | 7 10 |
方程两边同时乘以: | ( | x | + | 243 | ) |
( | x | + | 129 | ) | = | 7 10 | ( | x | + | 243 | ) |
x | + | 129 | = | 7 10 | ( | x | + | 243 | ) |
x | + | 129 | = | 7 10 | x | + | 7 10 | × | 243 |
x | + | 129 | = | 7 10 | x | + | 1701 10 |
x | − | 7 10 | x | = | 1701 10 | − | 129 |
3 10 | x | = | 1701 10 | − | 129 |
3 10 | x | = | 411 10 |
x | = | 411 10 | ÷ | 3 10 |
= | 411 10 | × | 10 3 |
= | 137 | × | 1 |
x | = | 137 |