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umum = U
U + P = 180
U = 180 - P
2000P + 3000U = 440.000
2000P + 3000(180 - P) = 440.000
2000P + 540.000 - 3000P = 440.000
-1000P = -100.000
p = 100
karcis yg terjual utk pelajar adalah 100 biji