Jawab yaahh ,trima kasih

a. 3x + 4 = 13
3x = 13 -4
3x = 9
x = 3
b. 2 (x+4) = 16
2x + 8 = 16
2x = 16 - 8
2x = 8
x = 4
c. 4x + 2 = 2x + 10
4x - 2x = 10 - 2
2x = 8
x = 4
d. 2 (x - 4) = 4 (x + 4)
2x - 8 = 4x + 16
2x - 4x = 16 + 8
-2x = 24
x = -12