Jawabanmu

2014-09-09T21:15:12+07:00
3a + 5 - 2 (2a+1)
= 3a + 3 (2a+1)
= 3a + 6a + 3
= 9a +3
-3 = 9a
a = 9/-3
a= -3
2014-09-09T21:15:42+07:00
~ 3a + 5 - 4a - 2
~ 3a - 4a + 5 - 2
= -1a + 3

^^