A={2,4,8,12}
n(A)=4
B={1,2,3,4}
n(B)=4
C={4,8,12,14}
n(C)=4
D={3,1,4,2}
n(D)=4
E={−1,1}
n(E)=2
F={0,a}
n(F)=2
G={1,−1}
n(G)=2
H={0,1}
n(H)=2
Number of elements in A,B,C,D are same i.e. all have 4 elements. So ,they are comparable.
Now, we see B and D has same elements.
So, B and D are equal sets.
Similarly, E,F,G, H are comparable as they all have same number of elements i.e. 2.
Clearly , E and G has same elements.
So, E and G are equal sets.