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2/p + 2/q = 3 --> 3pq = 2q+ 2p
..
3pq = 12 q - 3p
3pq = 2q + 2p
..
12 q - 3p = 2q + 2p
10 q = 5p
p = 2q
..
2p - 3q = 1 --> 2(2q) - 3q= 1
4q - 3q = 1
q = 1
p = 2q --> p = 2
.
p + 2q = n
2 + 2(1) = n
n = 4