di bantu ya no 3 dan 4

No 3

a. 2x = 8
x = 8 : 2
x = 4
b. a (tambah) 5 = 10
a = 10 - 5
a = 5
c. 3x (tambah) 3 = 15
3x = 15 - 3
3x = 12
x = 12 : 3
x = 4
d. a - 8 = 20
a = 20 (tambah) 8
a = 28


maaf soalnya layar hp rusak