3(2a + 1) - 4(2a - 3 = 5. Nilai A =

3(2a + 1) - 4(2a - 3) = 5
6a +3 - 8a +12 = 5
6a -8a = 5 -3 -12
-2a = -20
a = -20/-2
a = 10

semoga membantu

3(2a + 1) - 4(2a - 3) = 5
6a + 3 - 8a + 12 = 5
6a - 8a + 3 + 12 = 5 (dekatkan yg sejenis)
-2a + 15 = 5
-2a = 5 - 15
-2a = -10
a = -10/-2
= 5