( | 600 | + | x | ) | ÷ | ( | 140 | + | x | ) | = | 3 |
Multiply both sides of the equation by: | ( | 140 | + | x | ) |
( | 600 | + | x | ) | = | 3 | ( | 140 | + | x | ) |
600 | + | x | = | 3 | ( | 140 | + | x | ) |
600 | + | x | = | 3 | × | 140 | + | 3 | x |
600 | + | x | = | 420 | + | 3 | x |
x | − | 3 | x | = | 420 | − | 600 |
- | 2 | x | = | 420 | − | 600 |
- | 2 | x | = | - | 180 |
180 | = | 2 | x |
2 | x | = | 180 |
x | = | 180 | ÷ | 2 |
= | 180 | × | 1 2 |
= | 90 | × | 1 |
x | = | 90 |