Nomor2. 4(×-11)-2×=12 Nomor3. 5(a+1)=10

4 (x-11)-2x = 12
4x - 44 - 2x = 12
4x - 2x = 12 + 44
2x = 56
x = 28


Nomor 3 :
5(a+1) = 10
5a+5 = 10
5a = 5
a = 1