ada yg bisa bantu nmr 3 dan 4? Makasih

3.
2a-3/2 = 2
2a = 2 + 3/2
2a = 7/2
a = 7/2 / 2
a = 7/4

4.
3(x-4) < 2(4x-1)
3x - 12 < 8x - 2
3x - 8x < -2 + 12
-5x < 10
x > 2 (A)