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2a=b
a irisan b = 9
a gabungan b =5
rumus nya yaitu
s=a+b-a irisan b+a gabubgan b
38=2a+a-9+5
3a=42
a=14
jadi 2a = 2 x 14 = 28
yang hanya gemar basket 28 - 9=
19 siswa