Answer:
8a + 4 =28
a = 3
Explanation:
1. 2/3 (12a + 6) = 28
2/3 x 12a = 8a
2/3 x 6 = 4
2. add the equation together:
8a + 4 = 28
3. solve if needed
8a + 4 = 28
- 4 - 4
============
8a = 24
4. get a alone to figure out what a equals:
8a 24
---- = -------
8 8
a = 3