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x=siswa pria
y=siswa wanita
x+y=40
y=40-x
69x+74y=72(x+y)
69x+74y=72(40)
69x+74(40-x)=2880
69x+2960-74x=2880
-5x=2880-2960
-5x=-80
x=-80/-5
x=16
Jadi banyak siswa pria adalah 16 siswa