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pelajar = y
x+y=320
×=320-y
50000x+30000y = 13jt
50000*(320-y)+30000y = 13jt
16jt-50000y+30000y = 13jt
20000y = 3jt
y = 150
x = 170
vip = 170 tiket
pelajar = 150 tiket